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Changes In Branch sqlite_stat4 Excluding Merge-Ins

This is equivalent to a diff from f2d175f975 to f86b75b6c7

2013-08-26
23:18
Merge the STAT4 capability into trunk. (check-in: a32af0abe5 user: drh tags: trunk)
2013-08-17
18:57
Adjustments to #ifdefs in analyze.c to all a clean compile with no extra code with both ENABLE_STAT3 and ENABLE_STAT4 and with neither. (Closed-Leaf check-in: f86b75b6c7 user: drh tags: sqlite_stat4)
16:37
Add the cache_spill pragma. Change the fullfsync and checkpoint_fullfsync pragmas to apply to all attached databases. (check-in: 65a85a156f user: drh tags: trunk)
2013-08-16
20:42
Add the cache_spill pragma. (check-in: cdb181c04f user: drh tags: cache_spill)
17:46
Add a test for the problem fixed by [91733bc485]. (check-in: 5c59110481 user: dan tags: sqlite_stat4)
12:26
Merge recent trunk changes into the STAT4 branch. (check-in: c69b512af2 user: drh tags: sqlite_stat4)
2013-08-15
22:40
Make sure that GROUP BY terms select input column names in preference to output column names, in compliance with the SQL standard. Ticket [1c69be2dafc28]. (check-in: f2d175f975 user: drh tags: trunk)
20:24
Bare identifiers in ORDER BY clauses bind more tightly to output column name, but identifiers in expressions bind more tightly to input column names. This is a compromise between SQL92 and SQL99 behavior and is what PostgreSQL and MS-SQL do. Ticket [f617ea3125e9c]. (check-in: c78b357c00 user: drh tags: trunk)

Changes to src/alter.c.

   683    683       return;
   684    684     }
   685    685   
   686    686     /* Ensure the default expression is something that sqlite3ValueFromExpr()
   687    687     ** can handle (i.e. not CURRENT_TIME etc.)
   688    688     */
   689    689     if( pDflt ){
   690         -    sqlite3_value *pVal;
          690  +    sqlite3_value *pVal = 0;
   691    691       if( sqlite3ValueFromExpr(db, pDflt, SQLITE_UTF8, SQLITE_AFF_NONE, &pVal) ){
   692    692         db->mallocFailed = 1;
   693    693         return;
   694    694       }
   695    695       if( !pVal ){
   696    696         sqlite3ErrorMsg(pParse, "Cannot add a column with non-constant default");
   697    697         return;

Changes to src/analyze.c.

    16     16   ** to help it make better decisions about how to perform queries.
    17     17   **
    18     18   ** The following system tables are or have been supported:
    19     19   **
    20     20   **    CREATE TABLE sqlite_stat1(tbl, idx, stat);
    21     21   **    CREATE TABLE sqlite_stat2(tbl, idx, sampleno, sample);
    22     22   **    CREATE TABLE sqlite_stat3(tbl, idx, nEq, nLt, nDLt, sample);
           23  +**    CREATE TABLE sqlite_stat4(tbl, idx, nEq, nLt, nDLt, sample);
    23     24   **
    24     25   ** Additional tables might be added in future releases of SQLite.
    25     26   ** The sqlite_stat2 table is not created or used unless the SQLite version
    26     27   ** is between 3.6.18 and 3.7.8, inclusive, and unless SQLite is compiled
    27     28   ** with SQLITE_ENABLE_STAT2.  The sqlite_stat2 table is deprecated.
    28     29   ** The sqlite_stat2 table is superseded by sqlite_stat3, which is only
    29     30   ** created and used by SQLite versions 3.7.9 and later and with
    30         -** SQLITE_ENABLE_STAT3 defined.  The fucntionality of sqlite_stat3
    31         -** is a superset of sqlite_stat2.  
           31  +** SQLITE_ENABLE_STAT3 defined.  The functionality of sqlite_stat3
           32  +** is a superset of sqlite_stat2.  The sqlite_stat4 is an enhanced
           33  +** version of sqlite_stat3 and is only available when compiled with
           34  +** SQLITE_ENABLE_STAT4 and in SQLite versions 3.8.0 and later.
           35  +**
           36  +** For most applications, sqlite_stat1 provides all the statisics required
           37  +** for the query planner to make good choices.
    32     38   **
    33     39   ** Format of sqlite_stat1:
    34     40   **
    35     41   ** There is normally one row per index, with the index identified by the
    36     42   ** name in the idx column.  The tbl column is the name of the table to
    37     43   ** which the index belongs.  In each such row, the stat column will be
    38     44   ** a string consisting of a list of integers.  The first integer in this
    39         -** list is the number of rows in the index and in the table.  The second
           45  +** list is the number of rows in the index.  (This is the same as the
           46  +** number of rows in the table, except for partial indices.)  The second
    40     47   ** integer is the average number of rows in the index that have the same
    41     48   ** value in the first column of the index.  The third integer is the average
    42     49   ** number of rows in the index that have the same value for the first two
    43     50   ** columns.  The N-th integer (for N>1) is the average number of rows in 
    44     51   ** the index which have the same value for the first N-1 columns.  For
    45     52   ** a K-column index, there will be K+1 integers in the stat column.  If
    46     53   ** the index is unique, then the last integer will be 1.
................................................................................
    79     86   ** The format for sqlite_stat2 is recorded here for legacy reference.  This
    80     87   ** version of SQLite does not support sqlite_stat2.  It neither reads nor
    81     88   ** writes the sqlite_stat2 table.  This version of SQLite only supports
    82     89   ** sqlite_stat3.
    83     90   **
    84     91   ** Format for sqlite_stat3:
    85     92   **
    86         -** The sqlite_stat3 is an enhancement to sqlite_stat2.  A new name is
    87         -** used to avoid compatibility problems.  
           93  +** The sqlite_stat3 format is a subset of sqlite_stat4.  Hence, the
           94  +** sqlite_stat4 format will be described first.  Further information
           95  +** about sqlite_stat3 follows the sqlite_stat4 description.
    88     96   **
    89         -** The format of the sqlite_stat3 table is similar to the format of
    90         -** the sqlite_stat2 table.  There are multiple entries for each index.
           97  +** Format for sqlite_stat4:
           98  +**
           99  +** As with sqlite_stat2, the sqlite_stat4 table contains histogram data
          100  +** to aid the query planner in choosing good indices based on the values
          101  +** that indexed columns are compared against in the WHERE clauses of
          102  +** queries.
          103  +**
          104  +** The sqlite_stat4 table contains multiple entries for each index.
    91    105   ** The idx column names the index and the tbl column is the table of the
    92    106   ** index.  If the idx and tbl columns are the same, then the sample is
    93         -** of the INTEGER PRIMARY KEY.  The sample column is a value taken from
    94         -** the left-most column of the index.  The nEq column is the approximate
    95         -** number of entires in the index whose left-most column exactly matches
    96         -** the sample.  nLt is the approximate number of entires whose left-most
    97         -** column is less than the sample.  The nDLt column is the approximate
    98         -** number of distinct left-most entries in the index that are less than
    99         -** the sample.
          107  +** of the INTEGER PRIMARY KEY.  The sample column is a blob which is the
          108  +** binary encoding of a key from the index, with the trailing rowid
          109  +** omitted.  The nEq column is a list of integers.  The first integer
          110  +** is the approximate number of entries in the index whose left-most 
          111  +** column exactly matches the left-most column of the sample.  The second
          112  +** integer in nEq is the approximate number of entries in the index where
          113  +** the first two columns match the first two columns of the sample.
          114  +** And so forth.  nLt is another list of integers that show the approximate
          115  +** number of entries that are strictly less than the sample.  The first
          116  +** integer in nLt contains the number of entries in the index where the
          117  +** left-most column is less than the left-most column of the sample.
          118  +** The K-th integer in the nLt entry is the number of index entries 
          119  +** where the first K columns are less than the first K columns of the
          120  +** sample.  The nDLt column is like nLt except that it contains the 
          121  +** number of distinct entries in the index that are less than the
          122  +** sample.
   100    123   **
   101         -** Future versions of SQLite might change to store a string containing
   102         -** multiple integers values in the nDLt column of sqlite_stat3.  The first
   103         -** integer will be the number of prior index entires that are distinct in
   104         -** the left-most column.  The second integer will be the number of prior index
   105         -** entries that are distinct in the first two columns.  The third integer
   106         -** will be the number of prior index entries that are distinct in the first
   107         -** three columns.  And so forth.  With that extension, the nDLt field is
   108         -** similar in function to the sqlite_stat1.stat field.
   109         -**
   110         -** There can be an arbitrary number of sqlite_stat3 entries per index.
   111         -** The ANALYZE command will typically generate sqlite_stat3 tables
          124  +** There can be an arbitrary number of sqlite_stat4 entries per index.
          125  +** The ANALYZE command will typically generate sqlite_stat4 tables
   112    126   ** that contain between 10 and 40 samples which are distributed across
   113    127   ** the key space, though not uniformly, and which include samples with
   114         -** largest possible nEq values.
          128  +** large nEq values.
          129  +**
          130  +** Format for sqlite_stat3 redux:
          131  +**
          132  +** The sqlite_stat3 table is like sqlite_stat4 except that it only
          133  +** looks at the left-most column of the index.  The sqlite_stat3.sample
          134  +** column contains the actual value of the left-most column instead
          135  +** of a blob encoding of the complete index key as is found in
          136  +** sqlite_stat4.sample.  The nEq, nLt, and nDLt entries of sqlite_stat3
          137  +** all contain just a single integer which is the same as the first
          138  +** integer in the equivalent columns in sqlite_stat4.
   115    139   */
   116    140   #ifndef SQLITE_OMIT_ANALYZE
   117    141   #include "sqliteInt.h"
   118    142   
          143  +#if defined(SQLITE_ENABLE_STAT4)
          144  +# define IsStat4     1
          145  +# define IsStat3     0
          146  +# define SQLITE_ENABLE_STAT34 1
          147  +#elif defined(SQLITE_ENABLE_STAT3)
          148  +# define IsStat4     0
          149  +# define IsStat3     1
          150  +# define SQLITE_ENABLE_STAT34 1
          151  +#else
          152  +# define IsStat4     0
          153  +# define IsStat3     0
          154  +# undef SQLITE_ENABLE_STAT34
          155  +#endif
          156  +
   119    157   /*
   120    158   ** This routine generates code that opens the sqlite_stat1 table for
   121    159   ** writing with cursor iStatCur. If the library was built with the
   122         -** SQLITE_ENABLE_STAT3 macro defined, then the sqlite_stat3 table is
          160  +** SQLITE_ENABLE_STAT4 macro defined, then the sqlite_stat4 table is
   123    161   ** opened for writing using cursor (iStatCur+1)
   124    162   **
   125    163   ** If the sqlite_stat1 tables does not previously exist, it is created.
   126         -** Similarly, if the sqlite_stat3 table does not exist and the library
   127         -** is compiled with SQLITE_ENABLE_STAT3 defined, it is created. 
          164  +** Similarly, if the sqlite_stat4 table does not exist and the library
          165  +** is compiled with SQLITE_ENABLE_STAT4 defined, it is created. 
   128    166   **
   129    167   ** Argument zWhere may be a pointer to a buffer containing a table name,
   130    168   ** or it may be a NULL pointer. If it is not NULL, then all entries in
   131         -** the sqlite_stat1 and (if applicable) sqlite_stat3 tables associated
          169  +** the sqlite_stat1 and (if applicable) sqlite_stat4 tables associated
   132    170   ** with the named table are deleted. If zWhere==0, then code is generated
   133    171   ** to delete all stat table entries.
   134    172   */
   135    173   static void openStatTable(
   136    174     Parse *pParse,          /* Parsing context */
   137    175     int iDb,                /* The database we are looking in */
   138    176     int iStatCur,           /* Open the sqlite_stat1 table on this cursor */
................................................................................
   140    178     const char *zWhereType  /* Either "tbl" or "idx" */
   141    179   ){
   142    180     static const struct {
   143    181       const char *zName;
   144    182       const char *zCols;
   145    183     } aTable[] = {
   146    184       { "sqlite_stat1", "tbl,idx,stat" },
   147         -#ifdef SQLITE_ENABLE_STAT3
          185  +#if defined(SQLITE_ENABLE_STAT4)
          186  +    { "sqlite_stat4", "tbl,idx,neq,nlt,ndlt,sample" },
          187  +    { "sqlite_stat3", 0 },
          188  +#elif defined(SQLITE_ENABLE_STAT3)
   148    189       { "sqlite_stat3", "tbl,idx,neq,nlt,ndlt,sample" },
          190  +    { "sqlite_stat4", 0 },
   149    191   #endif
   150    192     };
   151    193   
   152    194     int aRoot[] = {0, 0};
   153    195     u8 aCreateTbl[] = {0, 0};
   154    196   
   155    197     int i;
................................................................................
   164    206     /* Create new statistic tables if they do not exist, or clear them
   165    207     ** if they do already exist.
   166    208     */
   167    209     for(i=0; i<ArraySize(aTable); i++){
   168    210       const char *zTab = aTable[i].zName;
   169    211       Table *pStat;
   170    212       if( (pStat = sqlite3FindTable(db, zTab, pDb->zName))==0 ){
   171         -      /* The sqlite_stat[12] table does not exist. Create it. Note that a 
   172         -      ** side-effect of the CREATE TABLE statement is to leave the rootpage 
   173         -      ** of the new table in register pParse->regRoot. This is important 
   174         -      ** because the OpenWrite opcode below will be needing it. */
   175         -      sqlite3NestedParse(pParse,
   176         -          "CREATE TABLE %Q.%s(%s)", pDb->zName, zTab, aTable[i].zCols
   177         -      );
   178         -      aRoot[i] = pParse->regRoot;
   179         -      aCreateTbl[i] = OPFLAG_P2ISREG;
          213  +      if( aTable[i].zCols ){
          214  +        /* The sqlite_stat[12] table does not exist. Create it. Note that a 
          215  +        ** side-effect of the CREATE TABLE statement is to leave the rootpage 
          216  +        ** of the new table in register pParse->regRoot. This is important 
          217  +        ** because the OpenWrite opcode below will be needing it. */
          218  +        sqlite3NestedParse(pParse,
          219  +            "CREATE TABLE %Q.%s(%s)", pDb->zName, zTab, aTable[i].zCols
          220  +        );
          221  +        aRoot[i] = pParse->regRoot;
          222  +        aCreateTbl[i] = OPFLAG_P2ISREG;
          223  +      }
   180    224       }else{
   181    225         /* The table already exists. If zWhere is not NULL, delete all entries 
   182    226         ** associated with the table zWhere. If zWhere is NULL, delete the
   183    227         ** entire contents of the table. */
   184    228         aRoot[i] = pStat->tnum;
   185    229         sqlite3TableLock(pParse, iDb, aRoot[i], 1, zTab);
   186    230         if( zWhere ){
   187    231           sqlite3NestedParse(pParse,
   188    232              "DELETE FROM %Q.%s WHERE %s=%Q", pDb->zName, zTab, zWhereType, zWhere
   189    233           );
   190    234         }else{
   191         -        /* The sqlite_stat[12] table already exists.  Delete all rows. */
          235  +        /* The sqlite_stat[134] table already exists.  Delete all rows. */
   192    236           sqlite3VdbeAddOp2(v, OP_Clear, aRoot[i], iDb);
   193    237         }
   194    238       }
   195    239     }
   196    240   
   197         -  /* Open the sqlite_stat[13] tables for writing. */
   198         -  for(i=0; i<ArraySize(aTable); i++){
          241  +  /* Open the sqlite_stat[134] tables for writing. */
          242  +  for(i=0; i<ArraySize(aRoot); i++){
   199    243       sqlite3VdbeAddOp3(v, OP_OpenWrite, iStatCur+i, aRoot[i], iDb);
   200    244       sqlite3VdbeChangeP4(v, -1, (char *)3, P4_INT32);
   201    245       sqlite3VdbeChangeP5(v, aCreateTbl[i]);
          246  +    if( !IsStat3 && !IsStat4 ) break;
   202    247     }
   203    248   }
   204    249   
   205    250   /*
   206         -** Recommended number of samples for sqlite_stat3
          251  +** Recommended number of samples for sqlite_stat4
   207    252   */
   208         -#ifndef SQLITE_STAT3_SAMPLES
   209         -# define SQLITE_STAT3_SAMPLES 24
          253  +#ifndef SQLITE_STAT4_SAMPLES
          254  +# define SQLITE_STAT4_SAMPLES 24
   210    255   #endif
   211    256   
   212    257   /*
   213         -** Three SQL functions - stat3_init(), stat3_push(), and stat3_pop() -
          258  +** Three SQL functions - stat_init(), stat_push(), and stat_get() -
   214    259   ** share an instance of the following structure to hold their state
   215    260   ** information.
   216    261   */
   217         -typedef struct Stat3Accum Stat3Accum;
   218         -struct Stat3Accum {
          262  +typedef struct Stat4Accum Stat4Accum;
          263  +typedef struct Stat4Sample Stat4Sample;
          264  +struct Stat4Sample {
          265  +  i64 iRowid;                     /* Rowid in main table of the key */
          266  +  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
          267  +  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
          268  +  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
          269  +  u8 isPSample;                   /* True if a periodic sample */
          270  +  int iCol;                       /* If !isPSample, the reason for inclusion */
          271  +  u32 iHash;                      /* Tiebreaker hash */
          272  +};                                                    
          273  +struct Stat4Accum {
   219    274     tRowcnt nRow;             /* Number of rows in the entire table */
   220    275     tRowcnt nPSample;         /* How often to do a periodic sample */
   221         -  int iMin;                 /* Index of entry with minimum nEq and hash */
          276  +  int nCol;                 /* Number of columns in index + rowid */
   222    277     int mxSample;             /* Maximum number of samples to accumulate */
   223         -  int nSample;              /* Current number of samples */
          278  +  Stat4Sample current;      /* Current row as a Stat4Sample */
   224    279     u32 iPrn;                 /* Pseudo-random number used for sampling */
   225         -  struct Stat3Sample {
   226         -    i64 iRowid;                /* Rowid in main table of the key */
   227         -    tRowcnt nEq;               /* sqlite_stat3.nEq */
   228         -    tRowcnt nLt;               /* sqlite_stat3.nLt */
   229         -    tRowcnt nDLt;              /* sqlite_stat3.nDLt */
   230         -    u8 isPSample;              /* True if a periodic sample */
   231         -    u32 iHash;                 /* Tiebreaker hash */
   232         -  } *a;                     /* An array of samples */
          280  +  Stat4Sample *aBest;       /* Array of (nCol-1) best samples */
          281  +  int iMin;                 /* Index in a[] of entry with minimum score */
          282  +  int nSample;              /* Current number of samples */
          283  +  int iGet;                 /* Index of current sample accessed by stat_get() */
          284  +  Stat4Sample *a;           /* Array of mxSample Stat4Sample objects */
   233    285   };
   234    286   
   235         -#ifdef SQLITE_ENABLE_STAT3
   236    287   /*
   237         -** Implementation of the stat3_init(C,S) SQL function.  The two parameters
   238         -** are the number of rows in the table or index (C) and the number of samples
   239         -** to accumulate (S).
          288  +** Implementation of the stat_init(C,N,S) SQL function. The three parameters
          289  +** are the number of rows in the table or index (C), the number of columns
          290  +** in the index (N) and the number of samples to accumulate (S).
   240    291   **
   241         -** This routine allocates the Stat3Accum object.
   242         -**
   243         -** The return value is the Stat3Accum object (P).
          292  +** This routine allocates the Stat4Accum object in heap memory. The return 
          293  +** value is a pointer to the the Stat4Accum object encoded as a blob (i.e. 
          294  +** the size of the blob is sizeof(void*) bytes). 
   244    295   */
   245         -static void stat3Init(
          296  +static void statInit(
   246    297     sqlite3_context *context,
   247    298     int argc,
   248    299     sqlite3_value **argv
   249    300   ){
   250         -  Stat3Accum *p;
   251         -  tRowcnt nRow;
   252         -  int mxSample;
   253         -  int n;
          301  +  Stat4Accum *p;
          302  +  u8 *pSpace;                     /* Allocated space not yet assigned */
          303  +  tRowcnt nRow;                   /* Number of rows in table (C) */
          304  +  int mxSample;                   /* Maximum number of samples collected */
          305  +  int nCol;                       /* Number of columns in index being sampled */
          306  +  int n;                          /* Bytes of space to allocate */
          307  +  int i;                          /* Used to iterate through p->aSample[] */
   254    308   
          309  +  /* Decode the three function arguments */
   255    310     UNUSED_PARAMETER(argc);
   256    311     nRow = (tRowcnt)sqlite3_value_int64(argv[0]);
   257         -  mxSample = sqlite3_value_int(argv[1]);
   258         -  n = sizeof(*p) + sizeof(p->a[0])*mxSample;
   259         -  p = sqlite3MallocZero( n );
          312  +  mxSample = sqlite3_value_int(argv[2]);
          313  +  nCol = sqlite3_value_int(argv[1]);
          314  +  assert( nCol>1 );               /* >1 because it includes the rowid column */
          315  +
          316  +  /* Allocate the space required for the Stat4Accum object */
          317  +  n = sizeof(*p) 
          318  +    + sizeof(tRowcnt)*nCol                    /* Stat4Accum.anEq */
          319  +    + sizeof(tRowcnt)*nCol                    /* Stat4Accum.anLt */
          320  +    + sizeof(tRowcnt)*nCol                    /* Stat4Accum.anDLt */
          321  +    + sizeof(Stat4Sample)*(nCol+mxSample)     /* Stat4Accum.aBest[], a[] */
          322  +    + sizeof(tRowcnt)*3*nCol*(nCol+mxSample);
          323  +  p = sqlite3MallocZero(n);
   260    324     if( p==0 ){
   261    325       sqlite3_result_error_nomem(context);
   262    326       return;
   263    327     }
   264         -  p->a = (struct Stat3Sample*)&p[1];
          328  +
   265    329     p->nRow = nRow;
          330  +  p->nCol = nCol;
   266    331     p->mxSample = mxSample;
   267    332     p->nPSample = p->nRow/(mxSample/3+1) + 1;
          333  +  p->iGet = -1;
          334  +
          335  +  p->current.anDLt = (tRowcnt*)&p[1];
          336  +  p->current.anEq = &p->current.anDLt[nCol];
          337  +  p->current.anLt = &p->current.anEq[nCol];
   268    338     sqlite3_randomness(sizeof(p->iPrn), &p->iPrn);
          339  +
          340  +  /* Set up the Stat4Accum.a[] and aBest[] arrays */
          341  +  p->a = (struct Stat4Sample*)&p->current.anLt[nCol];
          342  +  p->aBest = &p->a[mxSample];
          343  +  pSpace = (u8*)(&p->a[mxSample+nCol]);
          344  +  for(i=0; i<(mxSample+nCol); i++){
          345  +    p->a[i].anEq = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nCol);
          346  +    p->a[i].anLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nCol);
          347  +    p->a[i].anDLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nCol);
          348  +  }
          349  +  assert( (pSpace - (u8*)p)==n );
          350  +
          351  +  for(i=0; i<nCol; i++){
          352  +    p->aBest[i].iCol = i;
          353  +  }
          354  +
          355  +  /* Return a pointer to the allocated object to the caller */
   269    356     sqlite3_result_blob(context, p, sizeof(p), sqlite3_free);
   270    357   }
   271         -static const FuncDef stat3InitFuncdef = {
   272         -  2,                /* nArg */
   273         -  SQLITE_UTF8,      /* iPrefEnc */
   274         -  0,                /* flags */
   275         -  0,                /* pUserData */
   276         -  0,                /* pNext */
   277         -  stat3Init,        /* xFunc */
   278         -  0,                /* xStep */
   279         -  0,                /* xFinalize */
   280         -  "stat3_init",     /* zName */
   281         -  0,                /* pHash */
   282         -  0                 /* pDestructor */
          358  +static const FuncDef statInitFuncdef = {
          359  +  3,               /* nArg */
          360  +  SQLITE_UTF8,     /* iPrefEnc */
          361  +  0,               /* flags */
          362  +  0,               /* pUserData */
          363  +  0,               /* pNext */
          364  +  statInit,        /* xFunc */
          365  +  0,               /* xStep */
          366  +  0,               /* xFinalize */
          367  +  "stat_init",     /* zName */
          368  +  0,               /* pHash */
          369  +  0                /* pDestructor */
   283    370   };
   284    371   
   285         -
   286         -/*
   287         -** Implementation of the stat3_push(nEq,nLt,nDLt,rowid,P) SQL function.  The
   288         -** arguments describe a single key instance.  This routine makes the 
   289         -** decision about whether or not to retain this key for the sqlite_stat3
   290         -** table.
          372  +#ifdef SQLITE_ENABLE_STAT34
          373  +/*
          374  +** Return true if pNew is to be preferred over pOld.
          375  +*/
          376  +static int sampleIsBetter(Stat4Sample *pNew, Stat4Sample *pOld){
          377  +  tRowcnt nEqNew = pNew->anEq[pNew->iCol];
          378  +  tRowcnt nEqOld = pOld->anEq[pOld->iCol];
          379  +
          380  +  assert( pOld->isPSample==0 && pNew->isPSample==0 );
          381  +  assert( IsStat4 || (pNew->iCol==0 && pOld->iCol==0) );
          382  +
          383  +  if( (nEqNew>nEqOld)
          384  +   || (nEqNew==nEqOld && pNew->iCol<pOld->iCol)
          385  +   || (nEqNew==nEqOld && pNew->iCol==pOld->iCol && pNew->iHash>pOld->iHash)
          386  +  ){
          387  +    return 1;
          388  +  }
          389  +  return 0;
          390  +}
          391  +
          392  +/*
          393  +** Copy the contents of object (*pFrom) into (*pTo).
          394  +*/
          395  +void sampleCopy(Stat4Accum *p, Stat4Sample *pTo, Stat4Sample *pFrom){
          396  +  pTo->iRowid = pFrom->iRowid;
          397  +  pTo->isPSample = pFrom->isPSample;
          398  +  pTo->iCol = pFrom->iCol;
          399  +  pTo->iHash = pFrom->iHash;
          400  +  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
          401  +  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
          402  +  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
          403  +}
          404  +
          405  +/*
          406  +** Copy the contents of sample *pNew into the p->a[] array. If necessary,
          407  +** remove the least desirable sample from p->a[] to make room.
          408  +*/
          409  +static void sampleInsert(Stat4Accum *p, Stat4Sample *pNew, int nEqZero){
          410  +  Stat4Sample *pSample;
          411  +  int i;
          412  +  i64 iSeq;
          413  +  i64 iPos;
          414  +
          415  +  assert( IsStat4 || nEqZero==0 );
          416  +
          417  +  if( pNew->isPSample==0 ){
          418  +    Stat4Sample *pUpgrade = 0;
          419  +    assert( pNew->anEq[pNew->iCol]>0 );
          420  +
          421  +    /* This sample is being added because the prefix that ends in column 
          422  +    ** iCol occurs many times in the table. However, if we have already
          423  +    ** added a sample that shares this prefix, there is no need to add
          424  +    ** this one. Instead, upgrade the priority of the highest priority
          425  +    ** existing sample that shares this prefix.  */
          426  +    for(i=p->nSample-1; i>=0; i--){
          427  +      Stat4Sample *pOld = &p->a[i];
          428  +      if( pOld->anEq[pNew->iCol]==0 ){
          429  +        if( pOld->isPSample ) return;
          430  +        assert( sampleIsBetter(pNew, pOld) );
          431  +        if( pUpgrade==0 || sampleIsBetter(pOld, pUpgrade) ){
          432  +          pUpgrade = pOld;
          433  +        }
          434  +      }
          435  +    }
          436  +    if( pUpgrade ){
          437  +      pUpgrade->iCol = pNew->iCol;
          438  +      pUpgrade->anEq[pUpgrade->iCol] = pNew->anEq[pUpgrade->iCol];
          439  +      goto find_new_min;
          440  +    }
          441  +  }
          442  +
          443  +  /* If necessary, remove sample iMin to make room for the new sample. */
          444  +  if( p->nSample>=p->mxSample ){
          445  +    Stat4Sample *pMin = &p->a[p->iMin];
          446  +    tRowcnt *anEq = pMin->anEq;
          447  +    tRowcnt *anLt = pMin->anLt;
          448  +    tRowcnt *anDLt = pMin->anDLt;
          449  +    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
          450  +    pSample = &p->a[p->nSample-1];
          451  +    pSample->anEq = anEq;
          452  +    pSample->anDLt = anDLt;
          453  +    pSample->anLt = anLt;
          454  +    p->nSample = p->mxSample-1;
          455  +  }
          456  +
          457  +  /* Figure out where in the a[] array the new sample should be inserted. */
          458  +  iSeq = pNew->anLt[p->nCol-1];
          459  +  for(iPos=p->nSample; iPos>0; iPos--){
          460  +    if( iSeq>p->a[iPos-1].anLt[p->nCol-1] ) break;
          461  +  }
          462  +
          463  +  /* Insert the new sample */
          464  +  pSample = &p->a[iPos];
          465  +  if( iPos!=p->nSample ){
          466  +    Stat4Sample *pEnd = &p->a[p->nSample];
          467  +    tRowcnt *anEq = pEnd->anEq;
          468  +    tRowcnt *anLt = pEnd->anLt;
          469  +    tRowcnt *anDLt = pEnd->anDLt;
          470  +    memmove(&p->a[iPos], &p->a[iPos+1], (p->nSample-iPos)*sizeof(p->a[0]));
          471  +    pSample->anEq = anEq;
          472  +    pSample->anDLt = anDLt;
          473  +    pSample->anLt = anLt;
          474  +  }
          475  +  p->nSample++;
          476  +  sampleCopy(p, pSample, pNew);
          477  +
          478  +  /* Zero the first nEqZero entries in the anEq[] array. */
          479  +  memset(pSample->anEq, 0, sizeof(tRowcnt)*nEqZero);
          480  +
          481  + find_new_min:
          482  +  if( p->nSample>=p->mxSample ){
          483  +    int iMin = -1;
          484  +    for(i=0; i<p->mxSample; i++){
          485  +      if( p->a[i].isPSample ) continue;
          486  +      if( iMin<0 || sampleIsBetter(&p->a[iMin], &p->a[i]) ){
          487  +        iMin = i;
          488  +      }
          489  +    }
          490  +    assert( iMin>=0 );
          491  +    p->iMin = iMin;
          492  +  }
          493  +}
          494  +#endif /* SQLITE_ENABLE_STAT34 */
          495  +
          496  +/*
          497  +** Field iChng of the index being scanned has changed. So at this point
          498  +** p->current contains a sample that reflects the previous row of the
          499  +** index. The value of anEq[iChng] and subsequent anEq[] elements are
          500  +** correct at this point.
          501  +*/
          502  +static void samplePushPrevious(Stat4Accum *p, int iChng){
          503  +#ifdef SQLITE_ENABLE_STAT4
          504  +  int i;
          505  +
          506  +  /* Check if any samples from the aBest[] array should be pushed
          507  +  ** into IndexSample.a[] at this point.  */
          508  +  for(i=(p->nCol-2); i>=iChng; i--){
          509  +    Stat4Sample *pBest = &p->aBest[i];
          510  +    if( p->nSample<p->mxSample
          511  +     || sampleIsBetter(pBest, &p->a[p->iMin])
          512  +    ){
          513  +      sampleInsert(p, pBest, i);
          514  +    }
          515  +  }
          516  +
          517  +  /* Update the anEq[] fields of any samples already collected. */
          518  +  for(i=p->nSample-1; i>=0; i--){
          519  +    int j;
          520  +    for(j=iChng; j<p->nCol; j++){
          521  +      if( p->a[i].anEq[j]==0 ) p->a[i].anEq[j] = p->current.anEq[j];
          522  +    }
          523  +  }
          524  +#endif
          525  +
          526  +#if defined(SQLITE_ENABLE_STAT3) && !defined(SQLITE_ENABLE_STAT4)
          527  +  if( iChng==0 ){
          528  +    tRowcnt nLt = p->current.anLt[0];
          529  +    tRowcnt nEq = p->current.anEq[0];
          530  +
          531  +    /* Check if this is to be a periodic sample. If so, add it. */
          532  +    if( (nLt/p->nPSample)!=(nLt+nEq)/p->nPSample ){
          533  +      p->current.isPSample = 1;
          534  +      sampleInsert(p, &p->current, 0);
          535  +      p->current.isPSample = 0;
          536  +    }else 
          537  +
          538  +    /* Or if it is a non-periodic sample. Add it in this case too. */
          539  +    if( p->nSample<p->mxSample || sampleIsBetter(&p->current, &p->a[p->iMin]) ){
          540  +      sampleInsert(p, &p->current, 0);
          541  +    }
          542  +  }
          543  +#endif
          544  +}
          545  +
          546  +/*
          547  +** Implementation of the stat_push SQL function. 
          548  +**
          549  +**    stat_push(P,R,C)
   291    550   **
   292         -** The return value is NULL.
          551  +** The return value is always NULL.
   293    552   */
   294         -static void stat3Push(
          553  +static void statPush(
   295    554     sqlite3_context *context,
   296    555     int argc,
   297    556     sqlite3_value **argv
   298    557   ){
   299         -  Stat3Accum *p = (Stat3Accum*)sqlite3_value_blob(argv[4]);
   300         -  tRowcnt nEq = sqlite3_value_int64(argv[0]);
   301         -  tRowcnt nLt = sqlite3_value_int64(argv[1]);
   302         -  tRowcnt nDLt = sqlite3_value_int64(argv[2]);
   303         -  i64 rowid = sqlite3_value_int64(argv[3]);
   304         -  u8 isPSample = 0;
   305         -  u8 doInsert = 0;
   306         -  int iMin = p->iMin;
   307         -  struct Stat3Sample *pSample;
   308    558     int i;
   309         -  u32 h;
   310         -
   311         -  UNUSED_PARAMETER(context);
   312         -  UNUSED_PARAMETER(argc);
   313         -  if( nEq==0 ) return;
   314         -  h = p->iPrn = p->iPrn*1103515245 + 12345;
   315         -  if( (nLt/p->nPSample)!=((nEq+nLt)/p->nPSample) ){
   316         -    doInsert = isPSample = 1;
   317         -  }else if( p->nSample<p->mxSample ){
   318         -    doInsert = 1;
   319         -  }else{
   320         -    if( nEq>p->a[iMin].nEq || (nEq==p->a[iMin].nEq && h>p->a[iMin].iHash) ){
   321         -      doInsert = 1;
   322         -    }
   323         -  }
   324         -  if( !doInsert ) return;
   325         -  if( p->nSample==p->mxSample ){
   326         -    assert( p->nSample - iMin - 1 >= 0 );
   327         -    memmove(&p->a[iMin], &p->a[iMin+1], sizeof(p->a[0])*(p->nSample-iMin-1));
   328         -    pSample = &p->a[p->nSample-1];
          559  +
          560  +  /* The three function arguments */
          561  +  Stat4Accum *p = (Stat4Accum*)sqlite3_value_blob(argv[0]);
          562  +  i64 rowid = sqlite3_value_int64(argv[1]);
          563  +  int iChng = sqlite3_value_int(argv[2]);
          564  +
          565  +  assert( p->nCol>1 );        /* Includes rowid field */
          566  +  assert( iChng<p->nCol );
          567  +
          568  +  /* p->current.anEq[0] is false the first time this function is called. */
          569  +  if( p->current.anEq[0] ){
          570  +
          571  +    samplePushPrevious(p, iChng);
          572  +
          573  +    /* Update anDLt[], anLt[] and anEq[] to reflect the values that apply
          574  +    ** to the current row of the index. */
          575  +    for(i=0; i<iChng; i++){
          576  +      p->current.anEq[i]++;
          577  +    }
          578  +    for(i=iChng; i<p->nCol; i++){
          579  +      p->current.anDLt[i]++;
          580  +      p->current.anLt[i] += p->current.anEq[i];
          581  +      p->current.anEq[i] = 1;
          582  +    }
          583  +
   329    584     }else{
   330         -    pSample = &p->a[p->nSample++];
   331         -  }
   332         -  pSample->iRowid = rowid;
   333         -  pSample->nEq = nEq;
   334         -  pSample->nLt = nLt;
   335         -  pSample->nDLt = nDLt;
   336         -  pSample->iHash = h;
   337         -  pSample->isPSample = isPSample;
   338         -
   339         -  /* Find the new minimum */
   340         -  if( p->nSample==p->mxSample ){
   341         -    pSample = p->a;
   342         -    i = 0;
   343         -    while( pSample->isPSample ){
   344         -      i++;
   345         -      pSample++;
   346         -      assert( i<p->nSample );
   347         -    }
   348         -    nEq = pSample->nEq;
   349         -    h = pSample->iHash;
   350         -    iMin = i;
   351         -    for(i++, pSample++; i<p->nSample; i++, pSample++){
   352         -      if( pSample->isPSample ) continue;
   353         -      if( pSample->nEq<nEq
   354         -       || (pSample->nEq==nEq && pSample->iHash<h)
   355         -      ){
   356         -        iMin = i;
   357         -        nEq = pSample->nEq;
   358         -        h = pSample->iHash;
          585  +    for(i=0; i<p->nCol; i++) p->current.anEq[i] = 1;
          586  +  }
          587  +
          588  +  if( IsStat4 || IsStat3 ){
          589  +    p->current.iRowid = rowid;
          590  +    p->current.iHash = p->iPrn = p->iPrn*1103515245 + 12345;
          591  +  }
          592  +
          593  +#ifdef SQLITE_ENABLE_STAT4
          594  +  {
          595  +    tRowcnt nLt = p->current.anLt[p->nCol-1];
          596  +
          597  +    /* Check if this is to be a periodic sample. If so, add it. */
          598  +    if( (nLt/p->nPSample)!=(nLt+1)/p->nPSample ){
          599  +      p->current.isPSample = 1;
          600  +      p->current.iCol = 0;
          601  +      sampleInsert(p, &p->current, p->nCol-1);
          602  +      p->current.isPSample = 0;
          603  +    }
          604  +
          605  +    /* Update the aBest[] array. */
          606  +    for(i=0; i<(p->nCol-1); i++){
          607  +      p->current.iCol = i;
          608  +      if( i>=iChng || sampleIsBetter(&p->current, &p->aBest[i]) ){
          609  +        sampleCopy(p, &p->aBest[i], &p->current);
   359    610         }
   360    611       }
   361         -    p->iMin = iMin;
   362    612     }
          613  +#endif
   363    614   }
   364         -static const FuncDef stat3PushFuncdef = {
   365         -  5,                /* nArg */
   366         -  SQLITE_UTF8,      /* iPrefEnc */
   367         -  0,                /* flags */
   368         -  0,                /* pUserData */
   369         -  0,                /* pNext */
   370         -  stat3Push,        /* xFunc */
   371         -  0,                /* xStep */
   372         -  0,                /* xFinalize */
   373         -  "stat3_push",     /* zName */
   374         -  0,                /* pHash */
   375         -  0                 /* pDestructor */
          615  +static const FuncDef statPushFuncdef = {
          616  +  3,               /* nArg */
          617  +  SQLITE_UTF8,     /* iPrefEnc */
          618  +  0,               /* flags */
          619  +  0,               /* pUserData */
          620  +  0,               /* pNext */
          621  +  statPush,        /* xFunc */
          622  +  0,               /* xStep */
          623  +  0,               /* xFinalize */
          624  +  "stat_push",     /* zName */
          625  +  0,               /* pHash */
          626  +  0                /* pDestructor */
   376    627   };
   377    628   
          629  +#define STAT_GET_STAT1 0          /* "stat" column of stat1 table */
          630  +#define STAT_GET_ROWID 1          /* "rowid" column of stat[34] entry */
          631  +#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
          632  +#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
          633  +#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */
          634  +
   378    635   /*
   379         -** Implementation of the stat3_get(P,N,...) SQL function.  This routine is
   380         -** used to query the results.  Content is returned for the Nth sqlite_stat3
   381         -** row where N is between 0 and S-1 and S is the number of samples.  The
   382         -** value returned depends on the number of arguments.
          636  +** Implementation of the stat_get(P,J) SQL function.  This routine is
          637  +** used to query the results.  Content is returned for parameter J
          638  +** which is one of the STAT_GET_xxxx values defined above.
   383    639   **
   384         -**   argc==2    result:  rowid
   385         -**   argc==3    result:  nEq
   386         -**   argc==4    result:  nLt
   387         -**   argc==5    result:  nDLt
          640  +** If neither STAT3 nor STAT4 are enabled, then J is always
          641  +** STAT_GET_STAT1 and is hence omitted and this routine becomes
          642  +** a one-parameter function, stat_get(P), that always returns the
          643  +** stat1 table entry information.
   388    644   */
   389         -static void stat3Get(
          645  +static void statGet(
   390    646     sqlite3_context *context,
   391    647     int argc,
   392    648     sqlite3_value **argv
   393    649   ){
   394         -  int n = sqlite3_value_int(argv[1]);
   395         -  Stat3Accum *p = (Stat3Accum*)sqlite3_value_blob(argv[0]);
   396         -
   397         -  assert( p!=0 );
   398         -  if( p->nSample<=n ) return;
   399         -  switch( argc ){
   400         -    case 2:  sqlite3_result_int64(context, p->a[n].iRowid); break;
   401         -    case 3:  sqlite3_result_int64(context, p->a[n].nEq);    break;
   402         -    case 4:  sqlite3_result_int64(context, p->a[n].nLt);    break;
   403         -    default: sqlite3_result_int64(context, p->a[n].nDLt);   break;
   404         -  }
   405         -}
   406         -static const FuncDef stat3GetFuncdef = {
   407         -  -1,               /* nArg */
   408         -  SQLITE_UTF8,      /* iPrefEnc */
   409         -  0,                /* flags */
   410         -  0,                /* pUserData */
   411         -  0,                /* pNext */
   412         -  stat3Get,         /* xFunc */
   413         -  0,                /* xStep */
   414         -  0,                /* xFinalize */
   415         -  "stat3_get",     /* zName */
   416         -  0,                /* pHash */
   417         -  0                 /* pDestructor */
          650  +  Stat4Accum *p = (Stat4Accum*)sqlite3_value_blob(argv[0]);
          651  +#ifdef SQLITE_ENABLE_STAT34
          652  +  /* STAT3 and STAT4 have a parameter on this routine. */
          653  +  int eCall = sqlite3_value_int(argv[1]);
          654  +  assert( argc==2 );
          655  +  assert( eCall==STAT_GET_STAT1 || eCall==STAT_GET_NEQ 
          656  +       || eCall==STAT_GET_ROWID || eCall==STAT_GET_NLT
          657  +       || eCall==STAT_GET_NDLT 
          658  +  );
          659  +  if( eCall==STAT_GET_STAT1 )
          660  +#else
          661  +  assert( argc==1 );
          662  +#endif
          663  +  {
          664  +    /* Return the value to store in the "stat" column of the sqlite_stat1
          665  +    ** table for this index.
          666  +    **
          667  +    ** The value is a string composed of a list of integers describing 
          668  +    ** the index. The first integer in the list is the total number of 
          669  +    ** entries in the index. There is one additional integer in the list 
          670  +    ** for each indexed column. This additional integer is an estimate of
          671  +    ** the number of rows matched by a stabbing query on the index using
          672  +    ** a key with the corresponding number of fields. In other words,
          673  +    ** if the index is on columns (a,b) and the sqlite_stat1 value is 
          674  +    ** "100 10 2", then SQLite estimates that:
          675  +    **
          676  +    **   * the index contains 100 rows,
          677  +    **   * "WHERE a=?" matches 10 rows, and
          678  +    **   * "WHERE a=? AND b=?" matches 2 rows.
          679  +    **
          680  +    ** If D is the count of distinct values and K is the total number of 
          681  +    ** rows, then each estimate is computed as:
          682  +    **
          683  +    **        I = (K+D-1)/D
          684  +    */
          685  +    char *z;
          686  +    int i;
          687  +
          688  +    char *zRet = sqlite3MallocZero(p->nCol * 25);
          689  +    if( zRet==0 ){
          690  +      sqlite3_result_error_nomem(context);
          691  +      return;
          692  +    }
          693  +
          694  +    sqlite3_snprintf(24, zRet, "%lld", p->nRow);
          695  +    z = zRet + sqlite3Strlen30(zRet);
          696  +    for(i=0; i<(p->nCol-1); i++){
          697  +      i64 nDistinct = p->current.anDLt[i] + 1;
          698  +      i64 iVal = (p->nRow + nDistinct - 1) / nDistinct;
          699  +      sqlite3_snprintf(24, z, " %lld", iVal);
          700  +      z += sqlite3Strlen30(z);
          701  +      assert( p->current.anEq[i] );
          702  +    }
          703  +    assert( z[0]=='\0' && z>zRet );
          704  +
          705  +    sqlite3_result_text(context, zRet, -1, sqlite3_free);
          706  +  }
          707  +#ifdef SQLITE_ENABLE_STAT34
          708  +  else if( eCall==STAT_GET_ROWID ){
          709  +    if( p->iGet<0 ){
          710  +      samplePushPrevious(p, 0);
          711  +      p->iGet = 0;
          712  +    }
          713  +    if( p->iGet<p->nSample ){
          714  +      sqlite3_result_int64(context, p->a[p->iGet].iRowid);
          715  +    }
          716  +  }else{
          717  +    tRowcnt *aCnt = 0;
          718  +
          719  +    assert( p->iGet<p->nSample );
          720  +    switch( eCall ){
          721  +      case STAT_GET_NEQ:  aCnt = p->a[p->iGet].anEq; break;
          722  +      case STAT_GET_NLT:  aCnt = p->a[p->iGet].anLt; break;
          723  +      default: {
          724  +        aCnt = p->a[p->iGet].anDLt; 
          725  +        p->iGet++;
          726  +        break;
          727  +      }
          728  +    }
          729  +
          730  +    if( IsStat3 ){
          731  +      sqlite3_result_int64(context, (i64)aCnt[0]);
          732  +    }else{
          733  +      char *zRet = sqlite3MallocZero(p->nCol * 25);
          734  +      if( zRet==0 ){
          735  +        sqlite3_result_error_nomem(context);
          736  +      }else{
          737  +        int i;
          738  +        char *z = zRet;
          739  +        for(i=0; i<p->nCol; i++){
          740  +          sqlite3_snprintf(24, z, "%lld ", aCnt[i]);
          741  +          z += sqlite3Strlen30(z);
          742  +        }
          743  +        assert( z[0]=='\0' && z>zRet );
          744  +        z[-1] = '\0';
          745  +        sqlite3_result_text(context, zRet, -1, sqlite3_free);
          746  +      }
          747  +    }
          748  +  }
          749  +#endif /* SQLITE_ENABLE_STAT34 */
          750  +}
          751  +static const FuncDef statGetFuncdef = {
          752  +  2,               /* nArg */
          753  +  SQLITE_UTF8,     /* iPrefEnc */
          754  +  0,               /* flags */
          755  +  0,               /* pUserData */
          756  +  0,               /* pNext */
          757  +  statGet,         /* xFunc */
          758  +  0,               /* xStep */
          759  +  0,               /* xFinalize */
          760  +  "stat_get",      /* zName */
          761  +  0,               /* pHash */
          762  +  0                /* pDestructor */
   418    763   };
   419         -#endif /* SQLITE_ENABLE_STAT3 */
   420    764   
   421         -
   422         -
          765  +static void callStatGet(Vdbe *v, int regStat4, int iParam, int regOut){
          766  +  assert( regOut!=regStat4 && regOut!=regStat4+1 );
          767  +#ifdef SQLITE_ENABLE_STAT34
          768  +  sqlite3VdbeAddOp2(v, OP_Integer, iParam, regStat4+1);
          769  +#else
          770  +  assert( iParam==STAT_GET_STAT1 );
          771  +#endif
          772  +  sqlite3VdbeAddOp3(v, OP_Function, 0, regStat4, regOut);
          773  +  sqlite3VdbeChangeP4(v, -1, (char*)&statGetFuncdef, P4_FUNCDEF);
          774  +  sqlite3VdbeChangeP5(v, 1 + IsStat3 + IsStat4);
          775  +}
   423    776   
   424    777   /*
   425    778   ** Generate code to do an analysis of all indices associated with
   426    779   ** a single table.
   427    780   */
   428    781   static void analyzeOneTable(
   429    782     Parse *pParse,   /* Parser context */
   430    783     Table *pTab,     /* Table whose indices are to be analyzed */
   431    784     Index *pOnlyIdx, /* If not NULL, only analyze this one index */
   432    785     int iStatCur,    /* Index of VdbeCursor that writes the sqlite_stat1 table */
   433         -  int iMem         /* Available memory locations begin here */
          786  +  int iMem,        /* Available memory locations begin here */
          787  +  int iTab         /* Next available cursor */
   434    788   ){
   435    789     sqlite3 *db = pParse->db;    /* Database handle */
   436    790     Index *pIdx;                 /* An index to being analyzed */
   437    791     int iIdxCur;                 /* Cursor open on index being analyzed */
          792  +  int iTabCur;                 /* Table cursor */
   438    793     Vdbe *v;                     /* The virtual machine being built up */
   439    794     int i;                       /* Loop counter */
   440         -  int topOfLoop;               /* The top of the loop */
   441         -  int endOfLoop;               /* The end of the loop */
   442    795     int jZeroRows = -1;          /* Jump from here if number of rows is zero */
   443    796     int iDb;                     /* Index of database containing pTab */
   444    797     u8 needTableCnt = 1;         /* True to count the table */
          798  +  int regNewRowid = iMem++;    /* Rowid for the inserted record */
          799  +  int regStat4 = iMem++;       /* Register to hold Stat4Accum object */
          800  +  int regRowid = iMem++;       /* Rowid argument passed to stat_push() */
          801  +  int regChng = iMem++;        /* Index of changed index field */
          802  +  int regTemp = iMem++;        /* Temporary use register */
   445    803     int regTabname = iMem++;     /* Register containing table name */
   446    804     int regIdxname = iMem++;     /* Register containing index name */
   447         -  int regStat1 = iMem++;       /* The stat column of sqlite_stat1 */
   448         -#ifdef SQLITE_ENABLE_STAT3
   449         -  int regNumEq = regStat1;     /* Number of instances.  Same as regStat1 */
   450         -  int regNumLt = iMem++;       /* Number of keys less than regSample */
   451         -  int regNumDLt = iMem++;      /* Number of distinct keys less than regSample */
   452         -  int regSample = iMem++;      /* The next sample value */
   453         -  int regRowid = regSample;    /* Rowid of a sample */
   454         -  int regAccum = iMem++;       /* Register to hold Stat3Accum object */
   455         -  int regLoop = iMem++;        /* Loop counter */
   456         -  int regCount = iMem++;       /* Number of rows in the table or index */
   457         -  int regTemp1 = iMem++;       /* Intermediate register */
   458         -  int regTemp2 = iMem++;       /* Intermediate register */
   459         -  int once = 1;                /* One-time initialization */
   460         -  int shortJump = 0;           /* Instruction address */
   461         -  int iTabCur = pParse->nTab++; /* Table cursor */
   462         -#endif
   463         -  int regCol = iMem++;         /* Content of a column in analyzed table */
   464         -  int regRec = iMem++;         /* Register holding completed record */
   465         -  int regTemp = iMem++;        /* Temporary use register */
   466         -  int regNewRowid = iMem++;    /* Rowid for the inserted record */
          805  +  int regStat1 = iMem++;       /* Value for the stat column of sqlite_stat1 */
          806  +  int regPrev = iMem;          /* MUST BE LAST (see below) */
   467    807   
   468         -
          808  +  pParse->nMem = MAX(pParse->nMem, iMem);
   469    809     v = sqlite3GetVdbe(pParse);
   470    810     if( v==0 || NEVER(pTab==0) ){
   471    811       return;
   472    812     }
   473    813     if( pTab->tnum==0 ){
   474    814       /* Do not gather statistics on views or virtual tables */
   475    815       return;
................................................................................
   485    825   #ifndef SQLITE_OMIT_AUTHORIZATION
   486    826     if( sqlite3AuthCheck(pParse, SQLITE_ANALYZE, pTab->zName, 0,
   487    827         db->aDb[iDb].zName ) ){
   488    828       return;
   489    829     }
   490    830   #endif
   491    831   
   492         -  /* Establish a read-lock on the table at the shared-cache level. */
          832  +  /* Establish a read-lock on the table at the shared-cache level. 
          833  +  ** Open a read-only cursor on the table. Also allocate a cursor number
          834  +  ** to use for scanning indexes (iIdxCur). No index cursor is opened at
          835  +  ** this time though.  */
   493    836     sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
   494         -
   495         -  iIdxCur = pParse->nTab++;
          837  +  iTabCur = iTab++;
          838  +  iIdxCur = iTab++;
          839  +  pParse->nTab = MAX(pParse->nTab, iTab);
          840  +  sqlite3OpenTable(pParse, iTabCur, iDb, pTab, OP_OpenRead);
   496    841     sqlite3VdbeAddOp4(v, OP_String8, 0, regTabname, 0, pTab->zName, 0);
          842  +
   497    843     for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
   498         -    int nCol;
   499         -    KeyInfo *pKey;
   500         -    int addrIfNot = 0;           /* address of OP_IfNot */
   501         -    int *aChngAddr;              /* Array of jump instruction addresses */
          844  +    int nCol;                     /* Number of columns indexed by pIdx */
          845  +    KeyInfo *pKey;                /* KeyInfo structure for pIdx */
          846  +    int *aGotoChng;               /* Array of jump instruction addresses */
          847  +    int addrRewind;               /* Address of "OP_Rewind iIdxCur" */
          848  +    int addrGotoChng0;            /* Address of "Goto addr_chng_0" */
          849  +    int addrNextRow;              /* Address of "next_row:" */
   502    850   
   503    851       if( pOnlyIdx && pOnlyIdx!=pIdx ) continue;
   504    852       if( pIdx->pPartIdxWhere==0 ) needTableCnt = 0;
   505    853       VdbeNoopComment((v, "Begin analysis of %s", pIdx->zName));
   506    854       nCol = pIdx->nColumn;
   507         -    aChngAddr = sqlite3DbMallocRaw(db, sizeof(int)*nCol);
   508         -    if( aChngAddr==0 ) continue;
          855  +    aGotoChng = sqlite3DbMallocRaw(db, sizeof(int)*(nCol+1));
          856  +    if( aGotoChng==0 ) continue;
   509    857       pKey = sqlite3IndexKeyinfo(pParse, pIdx);
   510         -    if( iMem+1+(nCol*2)>pParse->nMem ){
   511         -      pParse->nMem = iMem+1+(nCol*2);
   512         -    }
   513         -
   514         -    /* Open a cursor to the index to be analyzed. */
   515         -    assert( iDb==sqlite3SchemaToIndex(db, pIdx->pSchema) );
   516         -    sqlite3VdbeAddOp4(v, OP_OpenRead, iIdxCur, pIdx->tnum, iDb,
   517         -        (char *)pKey, P4_KEYINFO_HANDOFF);
   518         -    VdbeComment((v, "%s", pIdx->zName));
   519    858   
   520    859       /* Populate the register containing the index name. */
   521    860       sqlite3VdbeAddOp4(v, OP_String8, 0, regIdxname, 0, pIdx->zName, 0);
   522    861   
   523         -#ifdef SQLITE_ENABLE_STAT3
   524         -    if( once ){
   525         -      once = 0;
   526         -      sqlite3OpenTable(pParse, iTabCur, iDb, pTab, OP_OpenRead);
   527         -    }
   528         -    sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regCount);
   529         -    sqlite3VdbeAddOp2(v, OP_Integer, SQLITE_STAT3_SAMPLES, regTemp1);
   530         -    sqlite3VdbeAddOp2(v, OP_Integer, 0, regNumEq);
   531         -    sqlite3VdbeAddOp2(v, OP_Integer, 0, regNumLt);
   532         -    sqlite3VdbeAddOp2(v, OP_Integer, -1, regNumDLt);
   533         -    sqlite3VdbeAddOp3(v, OP_Null, 0, regSample, regAccum);
   534         -    sqlite3VdbeAddOp4(v, OP_Function, 1, regCount, regAccum,
   535         -                      (char*)&stat3InitFuncdef, P4_FUNCDEF);
   536         -    sqlite3VdbeChangeP5(v, 2);
   537         -#endif /* SQLITE_ENABLE_STAT3 */
   538         -
   539         -    /* The block of memory cells initialized here is used as follows.
          862  +    /*
          863  +    ** Pseudo-code for loop that calls stat_push():
          864  +    **
          865  +    **   Rewind csr
          866  +    **   if eof(csr) goto end_of_scan;
          867  +    **   regChng = 0
          868  +    **   goto chng_addr_0;
          869  +    **
          870  +    **  next_row:
          871  +    **   regChng = 0
          872  +    **   if( idx(0) != regPrev(0) ) goto chng_addr_0
          873  +    **   regChng = 1
          874  +    **   if( idx(1) != regPrev(1) ) goto chng_addr_1
          875  +    **   ...
          876  +    **   regChng = N
          877  +    **   goto chng_addr_N
          878  +    **
          879  +    **  chng_addr_0:
          880  +    **   regPrev(0) = idx(0)
          881  +    **  chng_addr_1:
          882  +    **   regPrev(1) = idx(1)
          883  +    **  ...
          884  +    **
          885  +    **  chng_addr_N:
          886  +    **   regRowid = idx(rowid)
          887  +    **   stat_push(P, regRowid, regChng)
          888  +    **   Next csr
          889  +    **   if !eof(csr) goto next_row;
          890  +    **
          891  +    **  end_of_scan:
          892  +    */
          893  +
          894  +    /* Make sure there are enough memory cells allocated to accommodate 
          895  +    ** the regPrev array and a trailing rowid (the rowid slot is required
          896  +    ** when building a record to insert into the sample column of 
          897  +    ** the sqlite_stat4 table.  */
          898  +    pParse->nMem = MAX(pParse->nMem, regPrev+nCol);
          899  +
          900  +    /* Open a read-only cursor on the index being analyzed. */
          901  +    assert( iDb==sqlite3SchemaToIndex(db, pIdx->pSchema) );
          902  +    sqlite3VdbeAddOp3(v, OP_OpenRead, iIdxCur, pIdx->tnum, iDb);
          903  +    sqlite3VdbeChangeP4(v, -1, (char*)pKey, P4_KEYINFO_HANDOFF); 
          904  +    VdbeComment((v, "%s", pIdx->zName));
          905  +
          906  +    /* Invoke the stat_init() function. The arguments are:
          907  +    ** 
          908  +    **     * the number of rows in the index,
          909  +    **     * the number of columns in the index including the rowid,
          910  +    **     * the recommended number of samples for the stat3/stat4 table.
          911  +    */
          912  +    sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regStat4+1);
          913  +    sqlite3VdbeAddOp2(v, OP_Integer, nCol+1, regStat4+2);
          914  +    sqlite3VdbeAddOp2(v, OP_Integer, SQLITE_STAT4_SAMPLES, regStat4+3);
          915  +    sqlite3VdbeAddOp3(v, OP_Function, 0, regStat4+1, regStat4);
          916  +    sqlite3VdbeChangeP4(v, -1, (char*)&statInitFuncdef, P4_FUNCDEF);
          917  +    sqlite3VdbeChangeP5(v, 3);
          918  +
          919  +    /* Implementation of the following:
   540    920       **
   541         -    **    iMem:                
   542         -    **        The total number of rows in the table.
          921  +    **   Rewind csr
          922  +    **   if eof(csr) goto end_of_scan;
          923  +    **   regChng = 0
          924  +    **   goto next_push_0;
   543    925       **
   544         -    **    iMem+1 .. iMem+nCol: 
   545         -    **        Number of distinct entries in index considering the 
   546         -    **        left-most N columns only, where N is between 1 and nCol, 
   547         -    **        inclusive.
   548         -    **
   549         -    **    iMem+nCol+1 .. Mem+2*nCol:  
   550         -    **        Previous value of indexed columns, from left to right.
   551         -    **
   552         -    ** Cells iMem through iMem+nCol are initialized to 0. The others are 
   553         -    ** initialized to contain an SQL NULL.
          926  +    */
          927  +    addrRewind = sqlite3VdbeAddOp1(v, OP_Rewind, iIdxCur);
          928  +    sqlite3VdbeAddOp2(v, OP_Integer, 0, regChng);
          929  +    addrGotoChng0 = sqlite3VdbeAddOp0(v, OP_Goto);
          930  +
          931  +    /*
          932  +    **  next_row:
          933  +    **   regChng = 0
          934  +    **   if( idx(0) != regPrev(0) ) goto chng_addr_0
          935  +    **   regChng = 1
          936  +    **   if( idx(1) != regPrev(1) ) goto chng_addr_1
          937  +    **   ...
          938  +    **   regChng = N
          939  +    **   goto chng_addr_N
          940  +    */
          941  +    addrNextRow = sqlite3VdbeCurrentAddr(v);
          942  +    for(i=0; i<nCol; i++){
          943  +      char *pColl = (char*)sqlite3LocateCollSeq(pParse, pIdx->azColl[i]);
          944  +      sqlite3VdbeAddOp2(v, OP_Integer, i, regChng);
          945  +      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regTemp);
          946  +      aGotoChng[i] = 
          947  +      sqlite3VdbeAddOp4(v, OP_Ne, regTemp, 0, regPrev+i, pColl, P4_COLLSEQ);
          948  +      sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
          949  +    }
          950  +    sqlite3VdbeAddOp2(v, OP_Integer, nCol, regChng);
          951  +    aGotoChng[nCol] = sqlite3VdbeAddOp0(v, OP_Goto);
          952  +
          953  +    /*
          954  +    **  chng_addr_0:
          955  +    **   regPrev(0) = idx(0)
          956  +    **  chng_addr_1:
          957  +    **   regPrev(1) = idx(1)
          958  +    **  ...
   554    959       */
   555         -    for(i=0; i<=nCol; i++){
   556         -      sqlite3VdbeAddOp2(v, OP_Integer, 0, iMem+i);
   557         -    }
          960  +    sqlite3VdbeJumpHere(v, addrGotoChng0);
   558    961       for(i=0; i<nCol; i++){
   559         -      sqlite3VdbeAddOp2(v, OP_Null, 0, iMem+nCol+i+1);
          962  +      sqlite3VdbeJumpHere(v, aGotoChng[i]);
          963  +      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regPrev+i);
          964  +    }
          965  +
          966  +    /*
          967  +    **  chng_addr_N:
          968  +    **   regRowid = idx(rowid)
          969  +    **   stat_push(P, regRowid, regChng)
          970  +    **   Next csr
          971  +    **   if !eof(csr) goto next_row;
          972  +    */
          973  +    sqlite3VdbeJumpHere(v, aGotoChng[nCol]);
          974  +    sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, regRowid);
          975  +    sqlite3VdbeAddOp3(v, OP_Function, 1, regStat4, regTemp);
          976  +    sqlite3VdbeChangeP4(v, -1, (char*)&statPushFuncdef, P4_FUNCDEF);
          977  +    sqlite3VdbeChangeP5(v, 3);
          978  +    assert( regRowid==(regStat4+1) && regChng==(regStat4+2) );
          979  +    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow);
          980  +
          981  +    /* Add the entry to the stat1 table. */
          982  +    callStatGet(v, regStat4, STAT_GET_STAT1, regStat1);
          983  +    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "aaa", 0);
          984  +    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
          985  +    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regTemp, regNewRowid);
          986  +    sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
          987  +
          988  +    /* Add the entries to the stat3 or stat4 table. */
          989  +    if( IsStat3 || IsStat4 ){
          990  +      int regEq = regStat1;
          991  +      int regLt = regStat1+1;
          992  +      int regDLt = regStat1+2;
          993  +      int regSample = regStat1+3;
          994  +      int regCol = regStat1+4;
          995  +      int regSampleRowid = regCol + nCol;
          996  +      int addrNext;
          997  +      int addrIsNull;
          998  +
          999  +      pParse->nMem = MAX(pParse->nMem, regCol+nCol+1);
         1000  +
         1001  +      addrNext = sqlite3VdbeCurrentAddr(v);
         1002  +      callStatGet(v, regStat4, STAT_GET_ROWID, regSampleRowid);
         1003  +      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
         1004  +      callStatGet(v, regStat4, STAT_GET_NEQ, regEq);
         1005  +      callStatGet(v, regStat4, STAT_GET_NLT, regLt);
         1006  +      callStatGet(v, regStat4, STAT_GET_NDLT, regDLt);
         1007  +      sqlite3VdbeAddOp3(v, OP_NotExists, iTabCur, addrNext, regSampleRowid);
         1008  +      if( IsStat3 ){
         1009  +        int iCol = pIdx->aiColumn[0];
         1010  +        sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, iCol, regSample);
         1011  +      }else{
         1012  +        for(i=0; i<nCol; i++){
         1013  +          int iCol = pIdx->aiColumn[i];
         1014  +          sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, iCol, regCol+i);
         1015  +        }
         1016  +        sqlite3VdbeAddOp3(v, OP_MakeRecord, regCol, nCol+1, regSample);
         1017  +      }
         1018  +
         1019  +      sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 6, regTemp, "bbbbbb", 0);
         1020  +      sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur+1, regNewRowid);
         1021  +      sqlite3VdbeAddOp3(v, OP_Insert, iStatCur+1, regTemp, regNewRowid);
         1022  +      sqlite3VdbeAddOp2(v, OP_Goto, 0, addrNext);
         1023  +      sqlite3VdbeJumpHere(v, addrIsNull);
   560   1024       }
   561   1025   
   562         -    /* Start the analysis loop. This loop runs through all the entries in
   563         -    ** the index b-tree.  */
   564         -    endOfLoop = sqlite3VdbeMakeLabel(v);
   565         -    sqlite3VdbeAddOp2(v, OP_Rewind, iIdxCur, endOfLoop);
   566         -    topOfLoop = sqlite3VdbeCurrentAddr(v);
   567         -    sqlite3VdbeAddOp2(v, OP_AddImm, iMem, 1);  /* Increment row counter */
   568         -
   569         -    for(i=0; i<nCol; i++){
   570         -      CollSeq *pColl;
   571         -      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regCol);
   572         -      if( i==0 ){
   573         -        /* Always record the very first row */
   574         -        addrIfNot = sqlite3VdbeAddOp1(v, OP_IfNot, iMem+1);
   575         -      }
   576         -      assert( pIdx->azColl!=0 );
   577         -      assert( pIdx->azColl[i]!=0 );
   578         -      pColl = sqlite3LocateCollSeq(pParse, pIdx->azColl[i]);
   579         -      aChngAddr[i] = sqlite3VdbeAddOp4(v, OP_Ne, regCol, 0, iMem+nCol+i+1,
   580         -                                      (char*)pColl, P4_COLLSEQ);
   581         -      sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
   582         -      VdbeComment((v, "jump if column %d changed", i));
   583         -#ifdef SQLITE_ENABLE_STAT3
   584         -      if( i==0 ){
   585         -        sqlite3VdbeAddOp2(v, OP_AddImm, regNumEq, 1);
   586         -        VdbeComment((v, "incr repeat count"));
   587         -      }
   588         -#endif
   589         -    }
   590         -    sqlite3VdbeAddOp2(v, OP_Goto, 0, endOfLoop);
   591         -    for(i=0; i<nCol; i++){
   592         -      sqlite3VdbeJumpHere(v, aChngAddr[i]);  /* Set jump dest for the OP_Ne */
   593         -      if( i==0 ){
   594         -        sqlite3VdbeJumpHere(v, addrIfNot);   /* Jump dest for OP_IfNot */
   595         -#ifdef SQLITE_ENABLE_STAT3
   596         -        sqlite3VdbeAddOp4(v, OP_Function, 1, regNumEq, regTemp2,
   597         -                          (char*)&stat3PushFuncdef, P4_FUNCDEF);
   598         -        sqlite3VdbeChangeP5(v, 5);
   599         -        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, pIdx->nColumn, regRowid);
   600         -        sqlite3VdbeAddOp3(v, OP_Add, regNumEq, regNumLt, regNumLt);
   601         -        sqlite3VdbeAddOp2(v, OP_AddImm, regNumDLt, 1);
   602         -        sqlite3VdbeAddOp2(v, OP_Integer, 1, regNumEq);
   603         -#endif        
   604         -      }
   605         -      sqlite3VdbeAddOp2(v, OP_AddImm, iMem+i+1, 1);
   606         -      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, iMem+nCol+i+1);
   607         -    }
   608         -    sqlite3DbFree(db, aChngAddr);
   609         -
   610         -    /* Always jump here after updating the iMem+1...iMem+1+nCol counters */
   611         -    sqlite3VdbeResolveLabel(v, endOfLoop);
   612         -
   613         -    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, topOfLoop);
   614         -    sqlite3VdbeAddOp1(v, OP_Close, iIdxCur);
   615         -#ifdef SQLITE_ENABLE_STAT3
   616         -    sqlite3VdbeAddOp4(v, OP_Function, 1, regNumEq, regTemp2,
   617         -                      (char*)&stat3PushFuncdef, P4_FUNCDEF);
   618         -    sqlite3VdbeChangeP5(v, 5);
   619         -    sqlite3VdbeAddOp2(v, OP_Integer, -1, regLoop);
   620         -    shortJump = 
   621         -    sqlite3VdbeAddOp2(v, OP_AddImm, regLoop, 1);
   622         -    sqlite3VdbeAddOp4(v, OP_Function, 1, regAccum, regTemp1,
   623         -                      (char*)&stat3GetFuncdef, P4_FUNCDEF);
   624         -    sqlite3VdbeChangeP5(v, 2);
   625         -    sqlite3VdbeAddOp1(v, OP_IsNull, regTemp1);
   626         -    sqlite3VdbeAddOp3(v, OP_NotExists, iTabCur, shortJump, regTemp1);
   627         -    sqlite3VdbeAddOp3(v, OP_Column, iTabCur, pIdx->aiColumn[0], regSample);
   628         -    sqlite3ColumnDefault(v, pTab, pIdx->aiColumn[0], regSample);
   629         -    sqlite3VdbeAddOp4(v, OP_Function, 1, regAccum, regNumEq,
   630         -                      (char*)&stat3GetFuncdef, P4_FUNCDEF);
   631         -    sqlite3VdbeChangeP5(v, 3);
   632         -    sqlite3VdbeAddOp4(v, OP_Function, 1, regAccum, regNumLt,
   633         -                      (char*)&stat3GetFuncdef, P4_FUNCDEF);
   634         -    sqlite3VdbeChangeP5(v, 4);
   635         -    sqlite3VdbeAddOp4(v, OP_Function, 1, regAccum, regNumDLt,
   636         -                      (char*)&stat3GetFuncdef, P4_FUNCDEF);
   637         -    sqlite3VdbeChangeP5(v, 5);
   638         -    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 6, regRec, "bbbbbb", 0);
   639         -    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur+1, regNewRowid);
   640         -    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur+1, regRec, regNewRowid);
   641         -    sqlite3VdbeAddOp2(v, OP_Goto, 0, shortJump);
   642         -    sqlite3VdbeJumpHere(v, shortJump+2);
   643         -#endif        
   644         -
   645         -    /* Store the results in sqlite_stat1.
   646         -    **
   647         -    ** The result is a single row of the sqlite_stat1 table.  The first
   648         -    ** two columns are the names of the table and index.  The third column
   649         -    ** is a string composed of a list of integer statistics about the
   650         -    ** index.  The first integer in the list is the total number of entries
   651         -    ** in the index.  There is one additional integer in the list for each
   652         -    ** column of the table.  This additional integer is a guess of how many
   653         -    ** rows of the table the index will select.  If D is the count of distinct
   654         -    ** values and K is the total number of rows, then the integer is computed
   655         -    ** as:
   656         -    **
   657         -    **        I = (K+D-1)/D
   658         -    **
   659         -    ** If K==0 then no entry is made into the sqlite_stat1 table.  
   660         -    ** If K>0 then it is always the case the D>0 so division by zero
   661         -    ** is never possible.
   662         -    */
   663         -    sqlite3VdbeAddOp2(v, OP_SCopy, iMem, regStat1);
   664         -    jZeroRows = sqlite3VdbeAddOp1(v, OP_IfNot, iMem);
   665         -    for(i=0; i<nCol; i++){
   666         -      sqlite3VdbeAddOp4(v, OP_String8, 0, regTemp, 0, " ", 0);
   667         -      sqlite3VdbeAddOp3(v, OP_Concat, regTemp, regStat1, regStat1);
   668         -      sqlite3VdbeAddOp3(v, OP_Add, iMem, iMem+i+1, regTemp);
   669         -      sqlite3VdbeAddOp2(v, OP_AddImm, regTemp, -1);
   670         -      sqlite3VdbeAddOp3(v, OP_Divide, iMem+i+1, regTemp, regTemp);
   671         -      sqlite3VdbeAddOp1(v, OP_ToInt, regTemp);
   672         -      sqlite3VdbeAddOp3(v, OP_Concat, regTemp, regStat1, regStat1);
   673         -    }
   674         -    if( pIdx->pPartIdxWhere!=0 ) sqlite3VdbeJumpHere(v, jZeroRows);
   675         -    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regRec, "aaa", 0);
   676         -    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
   677         -    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regRec, regNewRowid);
   678         -    sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
   679         -    if( pIdx->pPartIdxWhere==0 ) sqlite3VdbeJumpHere(v, jZeroRows);
   680         -  }
         1026  +    /* Jump here if the index is empty */
         1027  +    sqlite3VdbeJumpHere(v, addrRewind);
         1028  +    sqlite3DbFree(db, aGotoChng);
         1029  +  }
         1030  +
   681   1031   
   682   1032     /* Create a single sqlite_stat1 entry containing NULL as the index
   683   1033     ** name and the row count as the content.
   684   1034     */
   685   1035     if( pOnlyIdx==0 && needTableCnt ){
   686         -    sqlite3VdbeAddOp3(v, OP_OpenRead, iIdxCur, pTab->tnum, iDb);
   687   1036       VdbeComment((v, "%s", pTab->zName));
   688         -    sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regStat1);
   689         -    sqlite3VdbeAddOp1(v, OP_Close, iIdxCur);
         1037  +    sqlite3VdbeAddOp2(v, OP_Count, iTabCur, regStat1);
   690   1038       jZeroRows = sqlite3VdbeAddOp1(v, OP_IfNot, regStat1);
   691   1039       sqlite3VdbeAddOp2(v, OP_Null, 0, regIdxname);
   692         -    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regRec, "aaa", 0);
         1040  +    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "aaa", 0);
   693   1041       sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
   694         -    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regRec, regNewRowid);
         1042  +    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regTemp, regNewRowid);
   695   1043       sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
   696   1044       sqlite3VdbeJumpHere(v, jZeroRows);
   697   1045     }
   698         -  if( pParse->nMem<regRec ) pParse->nMem = regRec;
   699   1046   }
   700   1047   
   701   1048   
   702   1049   /*
   703   1050   ** Generate code that will cause the most recent index analysis to
   704   1051   ** be loaded into internal hash tables where is can be used.
   705   1052   */
................................................................................
   715   1062   */
   716   1063   static void analyzeDatabase(Parse *pParse, int iDb){
   717   1064     sqlite3 *db = pParse->db;
   718   1065     Schema *pSchema = db->aDb[iDb].pSchema;    /* Schema of database iDb */
   719   1066     HashElem *k;
   720   1067     int iStatCur;
   721   1068     int iMem;
         1069  +  int iTab;
   722   1070   
   723   1071     sqlite3BeginWriteOperation(pParse, 0, iDb);
   724   1072     iStatCur = pParse->nTab;
   725   1073     pParse->nTab += 3;
   726   1074     openStatTable(pParse, iDb, iStatCur, 0, 0);
   727   1075     iMem = pParse->nMem+1;
         1076  +  iTab = pParse->nTab;
   728   1077     assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
   729   1078     for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
   730   1079       Table *pTab = (Table*)sqliteHashData(k);
   731         -    analyzeOneTable(pParse, pTab, 0, iStatCur, iMem);
         1080  +    analyzeOneTable(pParse, pTab, 0, iStatCur, iMem, iTab);
   732   1081     }
   733   1082     loadAnalysis(pParse, iDb);
   734   1083   }
   735   1084   
   736   1085   /*
   737   1086   ** Generate code that will do an analysis of a single table in
   738   1087   ** a database.  If pOnlyIdx is not NULL then it is a single index
................................................................................
   749   1098     iStatCur = pParse->nTab;
   750   1099     pParse->nTab += 3;
   751   1100     if( pOnlyIdx ){
   752   1101       openStatTable(pParse, iDb, iStatCur, pOnlyIdx->zName, "idx");
   753   1102     }else{
   754   1103       openStatTable(pParse, iDb, iStatCur, pTab->zName, "tbl");
   755   1104     }
   756         -  analyzeOneTable(pParse, pTab, pOnlyIdx, iStatCur, pParse->nMem+1);
         1105  +  analyzeOneTable(pParse, pTab, pOnlyIdx, iStatCur,pParse->nMem+1,pParse->nTab);
   757   1106     loadAnalysis(pParse, iDb);
   758   1107   }
   759   1108   
   760   1109   /*
   761   1110   ** Generate code for the ANALYZE command.  The parser calls this routine
   762   1111   ** when it recognizes an ANALYZE command.
   763   1112   **
................................................................................
   831   1180   ** callback routine.
   832   1181   */
   833   1182   typedef struct analysisInfo analysisInfo;
   834   1183   struct analysisInfo {
   835   1184     sqlite3 *db;
   836   1185     const char *zDatabase;
   837   1186   };
         1187  +
         1188  +/*
         1189  +** The first argument points to a nul-terminated string containing a
         1190  +** list of space separated integers. Read the first nOut of these into
         1191  +** the array aOut[].
         1192  +*/
         1193  +static void decodeIntArray(
         1194  +  char *zIntArray, 
         1195  +  int nOut, 
         1196  +  tRowcnt *aOut, 
         1197  +  int *pbUnordered
         1198  +){
         1199  +  char *z = zIntArray;
         1200  +  int c;
         1201  +  int i;
         1202  +  tRowcnt v;
         1203  +
         1204  +  assert( pbUnordered==0 || *pbUnordered==0 );
         1205  +  
         1206  +  if( z==0 ) z = "";
         1207  +  for(i=0; *z && i<nOut; i++){
         1208  +    v = 0;
         1209  +    while( (c=z[0])>='0' && c<='9' ){
         1210  +      v = v*10 + c - '0';
         1211  +      z++;
         1212  +    }
         1213  +    aOut[i] = v;
         1214  +    if( *z==' ' ) z++;
         1215  +  }
         1216  +  if( pbUnordered && strcmp(z, "unordered")==0 ){
         1217  +    *pbUnordered = 1;
         1218  +  }
         1219  +}
   838   1220   
   839   1221   /*
   840   1222   ** This callback is invoked once for each index when reading the
   841   1223   ** sqlite_stat1 table.  
   842   1224   **
   843   1225   **     argv[0] = name of the table
   844   1226   **     argv[1] = name of the index (might be NULL)
................................................................................
   847   1229   ** Entries for which argv[1]==NULL simply record the number of rows in
   848   1230   ** the table.
   849   1231   */
   850   1232   static int analysisLoader(void *pData, int argc, char **argv, char **NotUsed){
   851   1233     analysisInfo *pInfo = (analysisInfo*)pData;
   852   1234     Index *pIndex;
   853   1235     Table *pTable;
   854         -  int i, c, n;
   855         -  tRowcnt v;
   856   1236     const char *z;
   857   1237   
   858   1238     assert( argc==3 );
   859   1239     UNUSED_PARAMETER2(NotUsed, argc);
   860   1240   
   861   1241     if( argv==0 || argv[0]==0 || argv[2]==0 ){
   862   1242       return 0;
................................................................................
   866   1246       return 0;
   867   1247     }
   868   1248     if( argv[1] ){
   869   1249       pIndex = sqlite3FindIndex(pInfo->db, argv[1], pInfo->zDatabase);
   870   1250     }else{
   871   1251       pIndex = 0;
   872   1252     }
   873         -  n = pIndex ? pIndex->nColumn : 0;
   874   1253     z = argv[2];
   875         -  for(i=0; *z && i<=n; i++){
   876         -    v = 0;
   877         -    while( (c=z[0])>='0' && c<='9' ){
   878         -      v = v*10 + c - '0';
   879         -      z++;
   880         -    }
   881         -    if( i==0 && (pIndex==0 || pIndex->pPartIdxWhere==0) ){
   882         -      if( v>0 ) pTable->nRowEst = v;
   883         -      if( pIndex==0 ) break;
   884         -    }
   885         -    pIndex->aiRowEst[i] = v;
   886         -    if( *z==' ' ) z++;
   887         -    if( strcmp(z, "unordered")==0 ){
   888         -      pIndex->bUnordered = 1;
   889         -      break;
   890         -    }
         1254  +
         1255  +  if( pIndex ){
         1256  +    int bUnordered = 0;
         1257  +    decodeIntArray((char*)z, pIndex->nColumn+1, pIndex->aiRowEst, &bUnordered);
         1258  +    if( pIndex->pPartIdxWhere==0 ) pTable->nRowEst = pIndex->aiRowEst[0];
         1259  +    pIndex->bUnordered = bUnordered;
         1260  +  }else{
         1261  +    decodeIntArray((char*)z, 1, &pTable->nRowEst, 0);
   891   1262     }
         1263  +
   892   1264     return 0;
   893   1265   }
   894   1266   
   895   1267   /*
   896   1268   ** If the Index.aSample variable is not NULL, delete the aSample[] array
   897   1269   ** and its contents.
   898   1270   */
   899   1271   void sqlite3DeleteIndexSamples(sqlite3 *db, Index *pIdx){
   900         -#ifdef SQLITE_ENABLE_STAT3
         1272  +#ifdef SQLITE_ENABLE_STAT34
   901   1273     if( pIdx->aSample ){
   902   1274       int j;
   903   1275       for(j=0; j<pIdx->nSample; j++){
   904   1276         IndexSample *p = &pIdx->aSample[j];
   905         -      if( p->eType==SQLITE_TEXT || p->eType==SQLITE_BLOB ){
   906         -        sqlite3DbFree(db, p->u.z);
   907         -      }
         1277  +      sqlite3DbFree(db, p->p);
   908   1278       }
   909   1279       sqlite3DbFree(db, pIdx->aSample);
   910   1280     }
   911   1281     if( db && db->pnBytesFreed==0 ){
   912   1282       pIdx->nSample = 0;
   913   1283       pIdx->aSample = 0;
   914   1284     }
   915   1285   #else
   916   1286     UNUSED_PARAMETER(db);
   917   1287     UNUSED_PARAMETER(pIdx);
   918         -#endif
         1288  +#endif /* SQLITE_ENABLE_STAT34 */
         1289  +}
         1290  +
         1291  +#ifdef SQLITE_ENABLE_STAT34
         1292  +/*
         1293  +** Populate the pIdx->aAvgEq[] array based on the samples currently
         1294  +** stored in pIdx->aSample[]. 
         1295  +*/
         1296  +static void initAvgEq(Index *pIdx){
         1297  +  if( pIdx ){
         1298  +    IndexSample *aSample = pIdx->aSample;
         1299  +    IndexSample *pFinal = &aSample[pIdx->nSample-1];
         1300  +    int iCol;
         1301  +    for(iCol=0; iCol<pIdx->nColumn; iCol++){
         1302  +      int i;                    /* Used to iterate through samples */
         1303  +      tRowcnt sumEq = 0;        /* Sum of the nEq values */
         1304  +      int nSum = 0;             /* Number of terms contributing to sumEq */
         1305  +      tRowcnt avgEq = 0;
         1306  +      tRowcnt nDLt = pFinal->anDLt[iCol];
         1307  +
         1308  +      /* Set nSum to the number of distinct (iCol+1) field prefixes that
         1309  +      ** occur in the stat4 table for this index before pFinal. Set
         1310  +      ** sumEq to the sum of the nEq values for column iCol for the same
         1311  +      ** set (adding the value only once where there exist dupicate 
         1312  +      ** prefixes).  */
         1313  +      for(i=0; i<(pIdx->nSample-1); i++){
         1314  +        if( aSample[i].anDLt[iCol]!=aSample[i+1].anDLt[iCol] ){
         1315  +          sumEq += aSample[i].anEq[iCol];
         1316  +          nSum++;
         1317  +        }
         1318  +      }
         1319  +      if( nDLt>nSum ){
         1320  +        avgEq = (pFinal->anLt[iCol] - sumEq)/(nDLt - nSum);
         1321  +      }
         1322  +      if( avgEq==0 ) avgEq = 1;
         1323  +      pIdx->aAvgEq[iCol] = avgEq;
         1324  +      if( pIdx->nSampleCol==1 ) break;
         1325  +    }
         1326  +  }
   919   1327   }
   920   1328   
   921         -#ifdef SQLITE_ENABLE_STAT3
   922   1329   /*
   923         -** Load content from the sqlite_stat3 table into the Index.aSample[]
   924         -** arrays of all indices.
         1330  +** Load the content from either the sqlite_stat4 or sqlite_stat3 table 
         1331  +** into the relevant Index.aSample[] arrays.
         1332  +**
         1333  +** Arguments zSql1 and zSql2 must point to SQL statements that return
         1334  +** data equivalent to the following (statements are different for stat3,
         1335  +** see the caller of this function for details):
         1336  +**
         1337  +**    zSql1: SELECT idx,count(*) FROM %Q.sqlite_stat4 GROUP BY idx
         1338  +**    zSql2: SELECT idx,neq,nlt,ndlt,sample FROM %Q.sqlite_stat4
         1339  +**
         1340  +** where %Q is replaced with the database name before the SQL is executed.
   925   1341   */
   926         -static int loadStat3(sqlite3 *db, const char *zDb){
         1342  +static int loadStatTbl(
         1343  +  sqlite3 *db,                  /* Database handle */
         1344  +  int bStat3,                   /* Assume single column records only */
         1345  +  const char *zSql1,            /* SQL statement 1 (see above) */
         1346  +  const char *zSql2,            /* SQL statement 2 (see above) */
         1347  +  const char *zDb               /* Database name (e.g. "main") */
         1348  +){
   927   1349     int rc;                       /* Result codes from subroutines */
   928   1350     sqlite3_stmt *pStmt = 0;      /* An SQL statement being run */
   929   1351     char *zSql;                   /* Text of the SQL statement */
   930   1352     Index *pPrevIdx = 0;          /* Previous index in the loop */
   931         -  int idx = 0;                  /* slot in pIdx->aSample[] for next sample */
   932         -  int eType;                    /* Datatype of a sample */
   933   1353     IndexSample *pSample;         /* A slot in pIdx->aSample[] */
   934   1354   
   935   1355     assert( db->lookaside.bEnabled==0 );
   936         -  if( !sqlite3FindTable(db, "sqlite_stat3", zDb) ){
   937         -    return SQLITE_OK;
   938         -  }
   939         -
   940         -  zSql = sqlite3MPrintf(db, 
   941         -      "SELECT idx,count(*) FROM %Q.sqlite_stat3"
   942         -      " GROUP BY idx", zDb);
         1356  +  zSql = sqlite3MPrintf(db, zSql1, zDb);
   943   1357     if( !zSql ){
   944   1358       return SQLITE_NOMEM;
   945   1359     }
   946   1360     rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
   947   1361     sqlite3DbFree(db, zSql);
   948   1362     if( rc ) return rc;
   949   1363   
   950   1364     while( sqlite3_step(pStmt)==SQLITE_ROW ){
         1365  +    int nIdxCol = 1;              /* Number of columns in stat4 records */
         1366  +    int nAvgCol = 1;              /* Number of entries in Index.aAvgEq */
         1367  +
   951   1368       char *zIndex;   /* Index name */
   952   1369       Index *pIdx;    /* Pointer to the index object */
   953   1370       int nSample;    /* Number of samples */
         1371  +    int nByte;      /* Bytes of space required */
         1372  +    int i;          /* Bytes of space required */
         1373  +    tRowcnt *pSpace;
   954   1374   
   955   1375       zIndex = (char *)sqlite3_column_text(pStmt, 0);
   956   1376       if( zIndex==0 ) continue;
   957   1377       nSample = sqlite3_column_int(pStmt, 1);
   958   1378       pIdx = sqlite3FindIndex(db, zIndex, zDb);
   959         -    if( pIdx==0 ) continue;
   960         -    assert( pIdx->nSample==0 );
   961         -    pIdx->nSample = nSample;
   962         -    pIdx->aSample = sqlite3DbMallocZero(db, nSample*sizeof(IndexSample));
   963         -    pIdx->avgEq = pIdx->aiRowEst[1];
         1379  +    assert( pIdx==0 || bStat3 || pIdx->nSample==0 );
         1380  +    /* Index.nSample is non-zero at this point if data has already been
         1381  +    ** loaded from the stat4 table. In this case ignore stat3 data.  */
         1382  +    if( pIdx==0 || pIdx->nSample ) continue;
         1383  +    if( bStat3==0 ){
         1384  +      nIdxCol = pIdx->nColumn+1;
         1385  +      nAvgCol = pIdx->nColumn;
         1386  +    }
         1387  +    pIdx->nSampleCol = nIdxCol;
         1388  +    nByte = sizeof(IndexSample) * nSample;
         1389  +    nByte += sizeof(tRowcnt) * nIdxCol * 3 * nSample;
         1390  +    nByte += nAvgCol * sizeof(tRowcnt);     /* Space for Index.aAvgEq[] */
         1391  +
         1392  +    pIdx->aSample = sqlite3DbMallocZero(db, nByte);
   964   1393       if( pIdx->aSample==0 ){
   965         -      db->mallocFailed = 1;
   966   1394         sqlite3_finalize(pStmt);
   967   1395         return SQLITE_NOMEM;
   968   1396       }
         1397  +    pSpace = (tRowcnt*)&pIdx->aSample[nSample];
         1398  +    pIdx->aAvgEq = pSpace; pSpace += nAvgCol;
         1399  +    for(i=0; i<nSample; i++){
         1400  +      pIdx->aSample[i].anEq = pSpace; pSpace += nIdxCol;
         1401  +      pIdx->aSample[i].anLt = pSpace; pSpace += nIdxCol;
         1402  +      pIdx->aSample[i].anDLt = pSpace; pSpace += nIdxCol;
         1403  +    }
         1404  +    assert( ((u8*)pSpace)-nByte==(u8*)(pIdx->aSample) );
   969   1405     }
   970   1406     rc = sqlite3_finalize(pStmt);
   971   1407     if( rc ) return rc;
   972   1408   
   973         -  zSql = sqlite3MPrintf(db, 
   974         -      "SELECT idx,neq,nlt,ndlt,sample FROM %Q.sqlite_stat3", zDb);
         1409  +  zSql = sqlite3MPrintf(db, zSql2, zDb);
   975   1410     if( !zSql ){
   976   1411       return SQLITE_NOMEM;
   977   1412     }
   978   1413     rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
   979   1414     sqlite3DbFree(db, zSql);
   980   1415     if( rc ) return rc;
   981   1416   
   982   1417     while( sqlite3_step(pStmt)==SQLITE_ROW ){
   983         -    char *zIndex;   /* Index name */
   984         -    Index *pIdx;    /* Pointer to the index object */
   985         -    int i;          /* Loop counter */
   986         -    tRowcnt sumEq;  /* Sum of the nEq values */
         1418  +    char *zIndex;                 /* Index name */
         1419  +    Index *pIdx;                  /* Pointer to the index object */
         1420  +    int nCol = 1;                 /* Number of columns in index */
   987   1421   
   988   1422       zIndex = (char *)sqlite3_column_text(pStmt, 0);
   989   1423       if( zIndex==0 ) continue;
   990   1424       pIdx = sqlite3FindIndex(db, zIndex, zDb);
   991   1425       if( pIdx==0 ) continue;
   992         -    if( pIdx==pPrevIdx ){
   993         -      idx++;
   994         -    }else{
         1426  +    /* This next condition is true if data has already been loaded from 
         1427  +    ** the sqlite_stat4 table. In this case ignore stat3 data.  */
         1428  +    nCol = pIdx->nSampleCol;
         1429  +    if( bStat3 && nCol>1 ) continue;
         1430  +    if( pIdx!=pPrevIdx ){
         1431  +      initAvgEq(pPrevIdx);
   995   1432         pPrevIdx = pIdx;
   996         -      idx = 0;
   997   1433       }
   998         -    assert( idx<pIdx->nSample );
   999         -    pSample = &pIdx->aSample[idx];
  1000         -    pSample->nEq = (tRowcnt)sqlite3_column_int64(pStmt, 1);
  1001         -    pSample->nLt = (tRowcnt)sqlite3_column_int64(pStmt, 2);
  1002         -    pSample->nDLt = (tRowcnt)sqlite3_column_int64(pStmt, 3);
  1003         -    if( idx==pIdx->nSample-1 ){
  1004         -      if( pSample->nDLt>0 ){
  1005         -        for(i=0, sumEq=0; i<=idx-1; i++) sumEq += pIdx->aSample[i].nEq;
  1006         -        pIdx->avgEq = (pSample->nLt - sumEq)/pSample->nDLt;
  1007         -      }
  1008         -      if( pIdx->avgEq<=0 ) pIdx->avgEq = 1;
         1434  +    pSample = &pIdx->aSample[pIdx->nSample];
         1435  +    decodeIntArray((char*)sqlite3_column_text(pStmt,1), nCol, pSample->anEq, 0);
         1436  +    decodeIntArray((char*)sqlite3_column_text(pStmt,2), nCol, pSample->anLt, 0);
         1437  +    decodeIntArray((char*)sqlite3_column_text(pStmt,3), nCol, pSample->anDLt,0);
         1438  +
         1439  +    /* Take a copy of the sample. Add two 0x00 bytes the end of the buffer.
         1440  +    ** This is in case the sample record is corrupted. In that case, the
         1441  +    ** sqlite3VdbeRecordCompare() may read up to two varints past the
         1442  +    ** end of the allocated buffer before it realizes it is dealing with
         1443  +    ** a corrupt record. Adding the two 0x00 bytes prevents this from causing
         1444  +    ** a buffer overread.  */
         1445  +    pSample->n = sqlite3_column_bytes(pStmt, 4);
         1446  +    pSample->p = sqlite3DbMallocZero(db, pSample->n + 2);
         1447  +    if( pSample->p==0 ){
         1448  +      sqlite3_finalize(pStmt);
         1449  +      return SQLITE_NOMEM;
  1009   1450       }
  1010         -    eType = sqlite3_column_type(pStmt, 4);
  1011         -    pSample->eType = (u8)eType;
  1012         -    switch( eType ){
  1013         -      case SQLITE_INTEGER: {
  1014         -        pSample->u.i = sqlite3_column_int64(pStmt, 4);
  1015         -        break;
  1016         -      }
  1017         -      case SQLITE_FLOAT: {
  1018         -        pSample->u.r = sqlite3_column_double(pStmt, 4);
  1019         -        break;
  1020         -      }
  1021         -      case SQLITE_NULL: {
  1022         -        break;
  1023         -      }
  1024         -      default: assert( eType==SQLITE_TEXT || eType==SQLITE_BLOB ); {
  1025         -        const char *z = (const char *)(
  1026         -              (eType==SQLITE_BLOB) ?
  1027         -              sqlite3_column_blob(pStmt, 4):
  1028         -              sqlite3_column_text(pStmt, 4)
  1029         -           );
  1030         -        int n = z ? sqlite3_column_bytes(pStmt, 4) : 0;
  1031         -        pSample->nByte = n;
  1032         -        if( n < 1){
  1033         -          pSample->u.z = 0;
  1034         -        }else{
  1035         -          pSample->u.z = sqlite3DbMallocRaw(db, n);
  1036         -          if( pSample->u.z==0 ){
  1037         -            db->mallocFailed = 1;
  1038         -            sqlite3_finalize(pStmt);
  1039         -            return SQLITE_NOMEM;
  1040         -          }
  1041         -          memcpy(pSample->u.z, z, n);
  1042         -        }
  1043         -      }
  1044         -    }
         1451  +    memcpy(pSample->p, sqlite3_column_blob(pStmt, 4), pSample->n);
         1452  +    pIdx->nSample++;
         1453  +  }
         1454  +  rc = sqlite3_finalize(pStmt);
         1455  +  if( rc==SQLITE_OK ) initAvgEq(pPrevIdx);
         1456  +  return rc;
         1457  +}
         1458  +
         1459  +/*
         1460  +** Load content from the sqlite_stat4 and sqlite_stat3 tables into 
         1461  +** the Index.aSample[] arrays of all indices.
         1462  +*/
         1463  +static int loadStat4(sqlite3 *db, const char *zDb){
         1464  +  int rc = SQLITE_OK;             /* Result codes from subroutines */
         1465  +
         1466  +  assert( db->lookaside.bEnabled==0 );
         1467  +  if( sqlite3FindTable(db, "sqlite_stat4", zDb) ){
         1468  +    rc = loadStatTbl(db, 0,
         1469  +      "SELECT idx,count(*) FROM %Q.sqlite_stat4 GROUP BY idx", 
         1470  +      "SELECT idx,neq,nlt,ndlt,sample FROM %Q.sqlite_stat4",
         1471  +      zDb
         1472  +    );
         1473  +  }
         1474  +
         1475  +  if( rc==SQLITE_OK && sqlite3FindTable(db, "sqlite_stat3", zDb) ){
         1476  +    rc = loadStatTbl(db, 1,
         1477  +      "SELECT idx,count(*) FROM %Q.sqlite_stat3 GROUP BY idx", 
         1478  +      "SELECT idx,neq,nlt,ndlt,sqlite_record(sample) FROM %Q.sqlite_stat3",
         1479  +      zDb
         1480  +    );
  1045   1481     }
  1046         -  return sqlite3_finalize(pStmt);
         1482  +
         1483  +  return rc;
  1047   1484   }
  1048         -#endif /* SQLITE_ENABLE_STAT3 */
         1485  +#endif /* SQLITE_ENABLE_STAT34 */
  1049   1486   
  1050   1487   /*
  1051         -** Load the content of the sqlite_stat1 and sqlite_stat3 tables. The
         1488  +** Load the content of the sqlite_stat1 and sqlite_stat3/4 tables. The
  1052   1489   ** contents of sqlite_stat1 are used to populate the Index.aiRowEst[]
  1053         -** arrays. The contents of sqlite_stat3 are used to populate the
         1490  +** arrays. The contents of sqlite_stat3/4 are used to populate the
  1054   1491   ** Index.aSample[] arrays.
  1055   1492   **
  1056   1493   ** If the sqlite_stat1 table is not present in the database, SQLITE_ERROR
  1057         -** is returned. In this case, even if SQLITE_ENABLE_STAT3 was defined 
  1058         -** during compilation and the sqlite_stat3 table is present, no data is 
         1494  +** is returned. In this case, even if SQLITE_ENABLE_STAT3/4 was defined 
         1495  +** during compilation and the sqlite_stat3/4 table is present, no data is 
  1059   1496   ** read from it.
  1060   1497   **
  1061         -** If SQLITE_ENABLE_STAT3 was defined during compilation and the 
  1062         -** sqlite_stat3 table is not present in the database, SQLITE_ERROR is
         1498  +** If SQLITE_ENABLE_STAT3/4 was defined during compilation and the 
         1499  +** sqlite_stat4 table is not present in the database, SQLITE_ERROR is
  1063   1500   ** returned. However, in this case, data is read from the sqlite_stat1
  1064   1501   ** table (if it is present) before returning.
  1065   1502   **
  1066   1503   ** If an OOM error occurs, this function always sets db->mallocFailed.
  1067   1504   ** This means if the caller does not care about other errors, the return
  1068   1505   ** code may be ignored.
  1069   1506   */
................................................................................
  1077   1514     assert( db->aDb[iDb].pBt!=0 );
  1078   1515   
  1079   1516     /* Clear any prior statistics */
  1080   1517     assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
  1081   1518     for(i=sqliteHashFirst(&db->aDb[iDb].pSchema->idxHash);i;i=sqliteHashNext(i)){
  1082   1519       Index *pIdx = sqliteHashData(i);
  1083   1520       sqlite3DefaultRowEst(pIdx);
  1084         -#ifdef SQLITE_ENABLE_STAT3
         1521  +#ifdef SQLITE_ENABLE_STAT34
  1085   1522       sqlite3DeleteIndexSamples(db, pIdx);
  1086   1523       pIdx->aSample = 0;
  1087   1524   #endif
  1088   1525     }
  1089   1526   
  1090   1527     /* Check to make sure the sqlite_stat1 table exists */
  1091   1528     sInfo.db = db;
................................................................................
  1101   1538       rc = SQLITE_NOMEM;
  1102   1539     }else{
  1103   1540       rc = sqlite3_exec(db, zSql, analysisLoader, &sInfo, 0);
  1104   1541       sqlite3DbFree(db, zSql);
  1105   1542     }
  1106   1543   
  1107   1544   
  1108         -  /* Load the statistics from the sqlite_stat3 table. */
  1109         -#ifdef SQLITE_ENABLE_STAT3
         1545  +  /* Load the statistics from the sqlite_stat4 table. */
         1546  +#ifdef SQLITE_ENABLE_STAT34
  1110   1547     if( rc==SQLITE_OK ){
  1111   1548       int lookasideEnabled = db->lookaside.bEnabled;
  1112   1549       db->lookaside.bEnabled = 0;
  1113         -    rc = loadStat3(db, sInfo.zDatabase);
         1550  +    rc = loadStat4(db, sInfo.zDatabase);
  1114   1551       db->lookaside.bEnabled = lookasideEnabled;
  1115   1552     }
  1116   1553   #endif
  1117   1554   
  1118   1555     if( rc==SQLITE_NOMEM ){
  1119   1556       db->mallocFailed = 1;
  1120   1557     }
  1121   1558     return rc;
  1122   1559   }
  1123   1560   
  1124   1561   
  1125   1562   #endif /* SQLITE_OMIT_ANALYZE */

Changes to src/btree.c.

  2505   2505       pBt->max1bytePayload = 127;
  2506   2506     }else{
  2507   2507       pBt->max1bytePayload = (u8)pBt->maxLocal;
  2508   2508     }
  2509   2509     assert( pBt->maxLeaf + 23 <= MX_CELL_SIZE(pBt) );
  2510   2510     pBt->pPage1 = pPage1;
  2511   2511     pBt->nPage = nPage;
         2512  +assert( pPage1->leaf==0 || pPage1->leaf==1 );
  2512   2513     return SQLITE_OK;
  2513   2514   
  2514   2515   page1_init_failed:
  2515   2516     releasePage(pPage1);
  2516   2517     pBt->pPage1 = 0;
  2517   2518     return rc;
  2518   2519   }

Changes to src/build.c.

  2020   2020     Parse *pParse,         /* The parsing context */
  2021   2021     int iDb,               /* The database number */
  2022   2022     const char *zType,     /* "idx" or "tbl" */
  2023   2023     const char *zName      /* Name of index or table */
  2024   2024   ){
  2025   2025     int i;
  2026   2026     const char *zDbName = pParse->db->aDb[iDb].zName;
  2027         -  for(i=1; i<=3; i++){
         2027  +  for(i=1; i<=4; i++){
  2028   2028       char zTab[24];
  2029   2029       sqlite3_snprintf(sizeof(zTab),zTab,"sqlite_stat%d",i);
  2030   2030       if( sqlite3FindTable(pParse->db, zTab, zDbName) ){
  2031   2031         sqlite3NestedParse(pParse,
  2032   2032           "DELETE FROM %Q.%s WHERE %s=%Q",
  2033   2033           zDbName, zTab, zType, zName
  2034   2034         );

Changes to src/ctime.c.

   113    113   #endif
   114    114   #ifdef SQLITE_ENABLE_OVERSIZE_CELL_CHECK
   115    115     "ENABLE_OVERSIZE_CELL_CHECK",
   116    116   #endif
   117    117   #ifdef SQLITE_ENABLE_RTREE
   118    118     "ENABLE_RTREE",
   119    119   #endif
   120         -#ifdef SQLITE_ENABLE_STAT3
          120  +#if defined(SQLITE_ENABLE_STAT4)
          121  +  "ENABLE_STAT4",
          122  +#elif defined(SQLITE_ENABLE_STAT3)
   121    123     "ENABLE_STAT3",
   122    124   #endif
   123    125   #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
   124    126     "ENABLE_UNLOCK_NOTIFY",
   125    127   #endif
   126    128   #ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
   127    129     "ENABLE_UPDATE_DELETE_LIMIT",

Changes to src/func.c.

  1710   1710   
  1711   1711     for(i=0; i<ArraySize(aBuiltinFunc); i++){
  1712   1712       sqlite3FuncDefInsert(pHash, &aFunc[i]);
  1713   1713     }
  1714   1714     sqlite3RegisterDateTimeFunctions();
  1715   1715   #ifndef SQLITE_OMIT_ALTERTABLE
  1716   1716     sqlite3AlterFunctions();
         1717  +#endif
         1718  +#if defined(SQLITE_ENABLE_STAT3) || defined(SQLITE_ENABLE_STAT4)
         1719  +  sqlite3AnalyzeFunctions();
  1717   1720   #endif
  1718   1721   }

Changes to src/shell.c.

  1276   1276     if( nArg!=3 ) return 1;
  1277   1277     zTable = azArg[0];
  1278   1278     zType = azArg[1];
  1279   1279     zSql = azArg[2];
  1280   1280     
  1281   1281     if( strcmp(zTable, "sqlite_sequence")==0 ){
  1282   1282       zPrepStmt = "DELETE FROM sqlite_sequence;\n";
  1283         -  }else if( strcmp(zTable, "sqlite_stat1")==0 ){
         1283  +  }else if( sqlite3_strglob("sqlite_stat?", zTable)==0 ){
  1284   1284       fprintf(p->out, "ANALYZE sqlite_master;\n");
  1285   1285     }else if( strncmp(zTable, "sqlite_", 7)==0 ){
  1286   1286       return 0;
  1287   1287     }else if( strncmp(zSql, "CREATE VIRTUAL TABLE", 20)==0 ){
  1288   1288       char *zIns;
  1289   1289       if( !p->writableSchema ){
  1290   1290         fprintf(p->out, "PRAGMA writable_schema=ON;\n");

Changes to src/sqliteInt.h.

  1545   1545     Expr *pPartIdxWhere;     /* WHERE clause for partial indices */
  1546   1546     int tnum;                /* DB Page containing root of this index */
  1547   1547     u16 nColumn;             /* Number of columns in table used by this index */
  1548   1548     u8 onError;              /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
  1549   1549     unsigned autoIndex:2;    /* 1==UNIQUE, 2==PRIMARY KEY, 0==CREATE INDEX */
  1550   1550     unsigned bUnordered:1;   /* Use this index for == or IN queries only */
  1551   1551     unsigned uniqNotNull:1;  /* True if UNIQUE and NOT NULL for all columns */
  1552         -#ifdef SQLITE_ENABLE_STAT3
         1552  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
  1553   1553     int nSample;             /* Number of elements in aSample[] */
  1554         -  tRowcnt avgEq;           /* Average nEq value for key values not in aSample */
         1554  +  int nSampleCol;          /* Size of IndexSample.anEq[] and so on */
         1555  +  tRowcnt *aAvgEq;         /* Average nEq values for keys not in aSample */
  1555   1556     IndexSample *aSample;    /* Samples of the left-most key */
  1556   1557   #endif
  1557   1558   };
  1558   1559   
  1559   1560   /*
  1560   1561   ** Each sample stored in the sqlite_stat3 table is represented in memory 
  1561   1562   ** using a structure of this type.  See documentation at the top of the
  1562   1563   ** analyze.c source file for additional information.
  1563   1564   */
  1564   1565   struct IndexSample {
  1565         -  union {
  1566         -    char *z;        /* Value if eType is SQLITE_TEXT or SQLITE_BLOB */
  1567         -    double r;       /* Value if eType is SQLITE_FLOAT */
  1568         -    i64 i;          /* Value if eType is SQLITE_INTEGER */
  1569         -  } u;
  1570         -  u8 eType;         /* SQLITE_NULL, SQLITE_INTEGER ... etc. */
  1571         -  int nByte;        /* Size in byte of text or blob. */
  1572         -  tRowcnt nEq;      /* Est. number of rows where the key equals this sample */
  1573         -  tRowcnt nLt;      /* Est. number of rows where key is less than this sample */
  1574         -  tRowcnt nDLt;     /* Est. number of distinct keys less than this sample */
         1566  +  void *p;          /* Pointer to sampled record */
         1567  +  int n;            /* Size of record in bytes */
         1568  +  tRowcnt *anEq;    /* Est. number of rows where the key equals this sample */
         1569  +  tRowcnt *anLt;    /* Est. number of rows where key is less than this sample */
         1570  +  tRowcnt *anDLt;   /* Est. number of distinct keys less than this sample */
  1575   1571   };
  1576   1572   
  1577   1573   /*
  1578   1574   ** Each token coming out of the lexer is an instance of
  1579   1575   ** this structure.  Tokens are also used as part of an expression.
  1580   1576   **
  1581   1577   ** Note if Token.z==0 then Token.dyn and Token.n are undefined and
................................................................................
  3038   3034   const void *sqlite3ValueText(sqlite3_value*, u8);
  3039   3035   int sqlite3ValueBytes(sqlite3_value*, u8);
  3040   3036   void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8, 
  3041   3037                           void(*)(void*));
  3042   3038   void sqlite3ValueFree(sqlite3_value*);
  3043   3039   sqlite3_value *sqlite3ValueNew(sqlite3 *);
  3044   3040   char *sqlite3Utf16to8(sqlite3 *, const void*, int, u8);
  3045         -#ifdef SQLITE_ENABLE_STAT3
  3046         -char *sqlite3Utf8to16(sqlite3 *, u8, char *, int, int *);
  3047         -#endif
  3048   3041   int sqlite3ValueFromExpr(sqlite3 *, Expr *, u8, u8, sqlite3_value **);
  3049   3042   void sqlite3ValueApplyAffinity(sqlite3_value *, u8, u8);
  3050   3043   #ifndef SQLITE_AMALGAMATION
  3051   3044   extern const unsigned char sqlite3OpcodeProperty[];
  3052   3045   extern const unsigned char sqlite3UpperToLower[];
  3053   3046   extern const unsigned char sqlite3CtypeMap[];
  3054   3047   extern const Token sqlite3IntTokens[];
................................................................................
  3057   3050   #ifndef SQLITE_OMIT_WSD
  3058   3051   extern int sqlite3PendingByte;
  3059   3052   #endif
  3060   3053   #endif
  3061   3054   void sqlite3RootPageMoved(sqlite3*, int, int, int);
  3062   3055   void sqlite3Reindex(Parse*, Token*, Token*);
  3063   3056   void sqlite3AlterFunctions(void);
         3057  +void sqlite3AnalyzeFunctions(void);
  3064   3058   void sqlite3AlterRenameTable(Parse*, SrcList*, Token*);
  3065   3059   int sqlite3GetToken(const unsigned char *, int *);
  3066   3060   void sqlite3NestedParse(Parse*, const char*, ...);
  3067   3061   void sqlite3ExpirePreparedStatements(sqlite3*);
  3068   3062   int sqlite3CodeSubselect(Parse *, Expr *, int, int);
  3069   3063   void sqlite3SelectPrep(Parse*, Select*, NameContext*);
  3070   3064   int sqlite3MatchSpanName(const char*, const char*, const char*, const char*);
................................................................................
  3106   3100   char *sqlite3StrAccumFinish(StrAccum*);
  3107   3101   void sqlite3StrAccumReset(StrAccum*);
  3108   3102   void sqlite3SelectDestInit(SelectDest*,int,int);
  3109   3103   Expr *sqlite3CreateColumnExpr(sqlite3 *, SrcList *, int, int);
  3110   3104   
  3111   3105   void sqlite3BackupRestart(sqlite3_backup *);
  3112   3106   void sqlite3BackupUpdate(sqlite3_backup *, Pgno, const u8 *);
         3107  +
         3108  +int sqlite3Stat4ProbeSetValue(Parse*,Index*,UnpackedRecord**,Expr*,u8,int,int*);
         3109  +void sqlite3Stat4ProbeFree(UnpackedRecord*);
  3113   3110   
  3114   3111   /*
  3115   3112   ** The interface to the LEMON-generated parser
  3116   3113   */
  3117   3114   void *sqlite3ParserAlloc(void*(*)(size_t));
  3118   3115   void sqlite3ParserFree(void*, void(*)(void*));
  3119   3116   void sqlite3Parser(void*, int, Token, Parse*);

Changes to src/test_config.c.

   454    454   
   455    455   #ifdef SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS
   456    456     Tcl_SetVar2(interp, "sqlite_options", "schema_version", "0", TCL_GLOBAL_ONLY);
   457    457   #else
   458    458     Tcl_SetVar2(interp, "sqlite_options", "schema_version", "1", TCL_GLOBAL_ONLY);
   459    459   #endif
   460    460   
   461         -#ifdef SQLITE_ENABLE_STAT3
          461  +#ifdef SQLITE_ENABLE_STAT4
          462  +  Tcl_SetVar2(interp, "sqlite_options", "stat4", "1", TCL_GLOBAL_ONLY);
          463  +#else
          464  +  Tcl_SetVar2(interp, "sqlite_options", "stat4", "0", TCL_GLOBAL_ONLY);
          465  +#endif
          466  +#if defined(SQLITE_ENABLE_STAT3) && !defined(SQLITE_ENABLE_STAT4)
   462    467     Tcl_SetVar2(interp, "sqlite_options", "stat3", "1", TCL_GLOBAL_ONLY);
   463    468   #else
   464    469     Tcl_SetVar2(interp, "sqlite_options", "stat3", "0", TCL_GLOBAL_ONLY);
   465    470   #endif
   466    471   
   467    472   #if !defined(SQLITE_ENABLE_LOCKING_STYLE)
   468    473   #  if defined(__APPLE__)

Changes to src/test_func.c.

    14     14   */
    15     15   #include "sqlite3.h"
    16     16   #include "tcl.h"
    17     17   #include <stdlib.h>
    18     18   #include <string.h>
    19     19   #include <assert.h>
    20     20   
           21  +#include "sqliteInt.h"
           22  +#include "vdbeInt.h"
           23  +
    21     24   
    22     25   /*
    23     26   ** Allocate nByte bytes of space using sqlite3_malloc(). If the
    24     27   ** allocation fails, call sqlite3_result_error_nomem() to notify
    25     28   ** the database handle that malloc() has failed.
    26     29   */
    27     30   static void *testContextMalloc(sqlite3_context *context, int nByte){
................................................................................
   454    457         zOut[14-i*2+1] = "0123456789abcdef"[v.x[i]&0xf];
   455    458       }
   456    459     }
   457    460     zOut[16] = 0;
   458    461     sqlite3_result_text(context, zOut, -1, SQLITE_TRANSIENT);
   459    462   }
   460    463   
          464  +/*
          465  +** tclcmd: test_extract(record, field)
          466  +**
          467  +** This function implements an SQL user-function that accepts a blob
          468  +** containing a formatted database record as the first argument. The
          469  +** second argument is the index of the field within that record to
          470  +** extract and return.
          471  +*/
          472  +static void test_extract(
          473  +  sqlite3_context *context,
          474  +  int argc,
          475  +  sqlite3_value **argv
          476  +){
          477  +  sqlite3 *db = sqlite3_context_db_handle(context);
          478  +  u8 *pRec;
          479  +  u8 *pEndHdr;                    /* Points to one byte past record header */
          480  +  u8 *pHdr;                       /* Current point in record header */
          481  +  u8 *pBody;                      /* Current point in record data */
          482  +  u64 nHdr;                       /* Bytes in record header */
          483  +  int iIdx;                       /* Required field */
          484  +  int iCurrent = 0;               /* Current field */
          485  +
          486  +  assert( argc==2 );
          487  +  pRec = (u8*)sqlite3_value_blob(argv[0]);
          488  +  iIdx = sqlite3_value_int(argv[1]);
          489  +
          490  +  pHdr = pRec + sqlite3GetVarint(pRec, &nHdr);
          491  +  pBody = pEndHdr = &pRec[nHdr];
          492  +
          493  +  for(iCurrent=0; pHdr<pEndHdr && iCurrent<=iIdx; iCurrent++){
          494  +    u64 iSerialType;
          495  +    Mem mem;
          496  +
          497  +    memset(&mem, 0, sizeof(mem));
          498  +    mem.db = db;
          499  +    mem.enc = ENC(db);
          500  +    pHdr += sqlite3GetVarint(pHdr, &iSerialType);
          501  +    pBody += sqlite3VdbeSerialGet(pBody, (u32)iSerialType, &mem);
          502  +    sqlite3VdbeMemStoreType(&mem);
          503  +
          504  +    if( iCurrent==iIdx ){
          505  +      sqlite3_result_value(context, &mem);
          506  +    }
          507  +
          508  +    sqlite3DbFree(db, mem.zMalloc);
          509  +  }
          510  +}
          511  +
          512  +/*
          513  +** tclcmd: test_decode(record)
          514  +**
          515  +** This function implements an SQL user-function that accepts a blob
          516  +** containing a formatted database record as its only argument. It returns
          517  +** a tcl list (type SQLITE_TEXT) containing each of the values stored
          518  +** in the record.
          519  +*/
          520  +static void test_decode(
          521  +  sqlite3_context *context,
          522  +  int argc,
          523  +  sqlite3_value **argv
          524  +){
          525  +  sqlite3 *db = sqlite3_context_db_handle(context);
          526  +  u8 *pRec;
          527  +  u8 *pEndHdr;                    /* Points to one byte past record header */
          528  +  u8 *pHdr;                       /* Current point in record header */
          529  +  u8 *pBody;                      /* Current point in record data */
          530  +  u64 nHdr;                       /* Bytes in record header */
          531  +  Tcl_Obj *pRet;                  /* Return value */
          532  +
          533  +  pRet = Tcl_NewObj();
          534  +  Tcl_IncrRefCount(pRet);
          535  +
          536  +  assert( argc==1 );
          537  +  pRec = (u8*)sqlite3_value_blob(argv[0]);
          538  +
          539  +  pHdr = pRec + sqlite3GetVarint(pRec, &nHdr);
          540  +  pBody = pEndHdr = &pRec[nHdr];
          541  +  while( pHdr<pEndHdr ){
          542  +    Tcl_Obj *pVal = 0;
          543  +    u64 iSerialType;
          544  +    Mem mem;
          545  +
          546  +    memset(&mem, 0, sizeof(mem));
          547  +    mem.db = db;
          548  +    mem.enc = ENC(db);
          549  +    pHdr += sqlite3GetVarint(pHdr, &iSerialType);
          550  +    pBody += sqlite3VdbeSerialGet(pBody, (u32)iSerialType, &mem);
          551  +
          552  +    sqlite3VdbeMemStoreType(&mem);
          553  +    switch( sqlite3_value_type(&mem) ){
          554  +      case SQLITE_TEXT:
          555  +        pVal = Tcl_NewStringObj((const char*)sqlite3_value_text(&mem), -1);
          556  +        break;
          557  +
          558  +      case SQLITE_BLOB: {
          559  +        char hexdigit[] = {
          560  +          '0', '1', '2', '3', '4', '5', '6', '7',
          561  +          '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
          562  +        };
          563  +        int n = sqlite3_value_bytes(&mem);
          564  +        u8 *z = (u8*)sqlite3_value_blob(&mem);
          565  +        int i;
          566  +        pVal = Tcl_NewStringObj("x'", -1);
          567  +        for(i=0; i<n; i++){
          568  +          char hex[3];
          569  +          hex[0] = hexdigit[((z[i] >> 4) & 0x0F)];
          570  +          hex[1] = hexdigit[(z[i] & 0x0F)];
          571  +          hex[2] = '\0';
          572  +          Tcl_AppendStringsToObj(pVal, hex, 0);
          573  +        }
          574  +        Tcl_AppendStringsToObj(pVal, "'", 0);
          575  +        break;
          576  +      }
          577  +
          578  +      case SQLITE_FLOAT:
          579  +        pVal = Tcl_NewDoubleObj(sqlite3_value_double(&mem));
          580  +        break;
          581  +
          582  +      case SQLITE_INTEGER:
          583  +        pVal = Tcl_NewWideIntObj(sqlite3_value_int64(&mem));
          584  +        break;
          585  +
          586  +      case SQLITE_NULL:
          587  +        pVal = Tcl_NewStringObj("NULL", -1);
          588  +        break;
          589  +
          590  +      default:
          591  +        assert( 0 );
          592  +    }
          593  +
          594  +    Tcl_ListObjAppendElement(0, pRet, pVal);
          595  +
          596  +    if( mem.zMalloc ){
          597  +      sqlite3DbFree(db, mem.zMalloc);
          598  +    }
          599  +  }
          600  +
          601  +  sqlite3_result_text(context, Tcl_GetString(pRet), -1, SQLITE_TRANSIENT);
          602  +  Tcl_DecrRefCount(pRet);
          603  +}
          604  +
   461    605   
   462    606   static int registerTestFunctions(sqlite3 *db){
   463    607     static const struct {
   464    608        char *zName;
   465    609        signed char nArg;
   466    610        unsigned char eTextRep; /* 1: UTF-16.  0: UTF-8 */
   467    611        void (*xFunc)(sqlite3_context*,int,sqlite3_value **);
................................................................................
   478    622       { "test_auxdata",         -1, SQLITE_UTF8, test_auxdata},
   479    623       { "test_error",            1, SQLITE_UTF8, test_error},
   480    624       { "test_error",            2, SQLITE_UTF8, test_error},
   481    625       { "test_eval",             1, SQLITE_UTF8, test_eval},
   482    626       { "test_isolation",        2, SQLITE_UTF8, test_isolation},
   483    627       { "test_counter",          1, SQLITE_UTF8, counterFunc},
   484    628       { "real2hex",              1, SQLITE_UTF8, real2hex},
          629  +    { "test_decode",           1, SQLITE_UTF8, test_decode},
          630  +    { "test_extract",          2, SQLITE_UTF8, test_extract},
   485    631     };
   486    632     int i;
   487    633   
   488    634     for(i=0; i<sizeof(aFuncs)/sizeof(aFuncs[0]); i++){
   489    635       sqlite3_create_function(db, aFuncs[i].zName, aFuncs[i].nArg,
   490    636           aFuncs[i].eTextRep, 0, aFuncs[i].xFunc, 0, 0);
   491    637     }

Changes to src/update.c.

    57     57   ** on register iReg. This is used when an equivalent integer value is 
    58     58   ** stored in place of an 8-byte floating point value in order to save 
    59     59   ** space.
    60     60   */
    61     61   void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
    62     62     assert( pTab!=0 );
    63     63     if( !pTab->pSelect ){
    64         -    sqlite3_value *pValue;
           64  +    sqlite3_value *pValue = 0;
    65     65       u8 enc = ENC(sqlite3VdbeDb(v));
    66     66       Column *pCol = &pTab->aCol[i];
    67     67       VdbeComment((v, "%s.%s", pTab->zName, pCol->zName));
    68     68       assert( i<pTab->nCol );
    69     69       sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc, 
    70     70                            pCol->affinity, &pValue);
    71     71       if( pValue ){

Changes to src/utf.c.

   446    446     assert( (m.flags & MEM_Term)!=0 || db->mallocFailed );
   447    447     assert( (m.flags & MEM_Str)!=0 || db->mallocFailed );
   448    448     assert( (m.flags & MEM_Dyn)!=0 || db->mallocFailed );
   449    449     assert( m.z || db->mallocFailed );
   450    450     return m.z;
   451    451   }
   452    452   
   453         -/*
   454         -** Convert a UTF-8 string to the UTF-16 encoding specified by parameter
   455         -** enc. A pointer to the new string is returned, and the value of *pnOut
   456         -** is set to the length of the returned string in bytes. The call should
   457         -** arrange to call sqlite3DbFree() on the returned pointer when it is
   458         -** no longer required.
   459         -** 
   460         -** If a malloc failure occurs, NULL is returned and the db.mallocFailed
   461         -** flag set.
   462         -*/
   463         -#ifdef SQLITE_ENABLE_STAT3
   464         -char *sqlite3Utf8to16(sqlite3 *db, u8 enc, char *z, int n, int *pnOut){
   465         -  Mem m;
   466         -  memset(&m, 0, sizeof(m));
   467         -  m.db = db;
   468         -  sqlite3VdbeMemSetStr(&m, z, n, SQLITE_UTF8, SQLITE_STATIC);
   469         -  if( sqlite3VdbeMemTranslate(&m, enc) ){
   470         -    assert( db->mallocFailed );
   471         -    return 0;
   472         -  }
   473         -  assert( m.z==m.zMalloc );
   474         -  *pnOut = m.n;
   475         -  return m.z;
   476         -}
   477         -#endif
   478         -
   479    453   /*
   480    454   ** zIn is a UTF-16 encoded unicode string at least nChar characters long.
   481    455   ** Return the number of bytes in the first nChar unicode characters
   482    456   ** in pZ.  nChar must be non-negative.
   483    457   */
   484    458   int sqlite3Utf16ByteLen(const void *zIn, int nChar){
   485    459     int c;

Changes to src/vdbe.c.

   647    647       ** external allocations out of mem[p2] and set mem[p2] to be
   648    648       ** an undefined integer.  Opcodes will either fill in the integer
   649    649       ** value or convert mem[p2] to a different type.
   650    650       */
   651    651       assert( pOp->opflags==sqlite3OpcodeProperty[pOp->opcode] );
   652    652       if( pOp->opflags & OPFLG_OUT2_PRERELEASE ){
   653    653         assert( pOp->p2>0 );
   654         -      assert( pOp->p2<=p->nMem );
          654  +      assert( pOp->p2<=(p->nMem-p->nCursor) );
   655    655         pOut = &aMem[pOp->p2];
   656    656         memAboutToChange(p, pOut);
   657    657         VdbeMemRelease(pOut);
   658    658         pOut->flags = MEM_Int;
   659    659       }
   660    660   
   661    661       /* Sanity checking on other operands */
   662    662   #ifdef SQLITE_DEBUG
   663    663       if( (pOp->opflags & OPFLG_IN1)!=0 ){
   664    664         assert( pOp->p1>0 );
   665         -      assert( pOp->p1<=p->nMem );
          665  +      assert( pOp->p1<=(p->nMem-p->nCursor) );
   666    666         assert( memIsValid(&aMem[pOp->p1]) );
   667    667         REGISTER_TRACE(pOp->p1, &aMem[pOp->p1]);
   668    668       }
   669    669       if( (pOp->opflags & OPFLG_IN2)!=0 ){
   670    670         assert( pOp->p2>0 );
   671         -      assert( pOp->p2<=p->nMem );
          671  +      assert( pOp->p2<=(p->nMem-p->nCursor) );
   672    672         assert( memIsValid(&aMem[pOp->p2]) );
   673    673         REGISTER_TRACE(pOp->p2, &aMem[pOp->p2]);
   674    674       }
   675    675       if( (pOp->opflags & OPFLG_IN3)!=0 ){
   676    676         assert( pOp->p3>0 );
   677         -      assert( pOp->p3<=p->nMem );
          677  +      assert( pOp->p3<=(p->nMem-p->nCursor) );
   678    678         assert( memIsValid(&aMem[pOp->p3]) );
   679    679         REGISTER_TRACE(pOp->p3, &aMem[pOp->p3]);
   680    680       }
   681    681       if( (pOp->opflags & OPFLG_OUT2)!=0 ){
   682    682         assert( pOp->p2>0 );
   683         -      assert( pOp->p2<=p->nMem );
          683  +      assert( pOp->p2<=(p->nMem-p->nCursor) );
   684    684         memAboutToChange(p, &aMem[pOp->p2]);
   685    685       }
   686    686       if( (pOp->opflags & OPFLG_OUT3)!=0 ){
   687    687         assert( pOp->p3>0 );
   688         -      assert( pOp->p3<=p->nMem );
          688  +      assert( pOp->p3<=(p->nMem-p->nCursor) );
   689    689         memAboutToChange(p, &aMem[pOp->p3]);
   690    690       }
   691    691   #endif
   692    692     
   693    693       switch( pOp->opcode ){
   694    694   
   695    695   /*****************************************************************************
................................................................................
   774    774   
   775    775   /* Opcode:  Gosub P1 P2 * * *
   776    776   **
   777    777   ** Write the current address onto register P1
   778    778   ** and then jump to address P2.
   779    779   */
   780    780   case OP_Gosub: {            /* jump */
   781         -  assert( pOp->p1>0 && pOp->p1<=p->nMem );
          781  +  assert( pOp->p1>0 && pOp->p1<=(p->nMem-p->nCursor) );
   782    782     pIn1 = &aMem[pOp->p1];
   783    783     assert( (pIn1->flags & MEM_Dyn)==0 );
   784    784     memAboutToChange(p, pIn1);
   785    785     pIn1->flags = MEM_Int;
   786    786     pIn1->u.i = pc;
   787    787     REGISTER_TRACE(pOp->p1, pIn1);
   788    788     pc = pOp->p2 - 1;
................................................................................
   986    986   ** NULL values will not compare equal even if SQLITE_NULLEQ is set on
   987    987   ** OP_Ne or OP_Eq.
   988    988   */
   989    989   case OP_Null: {           /* out2-prerelease */
   990    990     int cnt;
   991    991     u16 nullFlag;
   992    992     cnt = pOp->p3-pOp->p2;
   993         -  assert( pOp->p3<=p->nMem );
          993  +  assert( pOp->p3<=(p->nMem-p->nCursor) );
   994    994     pOut->flags = nullFlag = pOp->p1 ? (MEM_Null|MEM_Cleared) : MEM_Null;
   995    995     while( cnt>0 ){
   996    996       pOut++;
   997    997       memAboutToChange(p, pOut);
   998    998       VdbeMemRelease(pOut);
   999    999       pOut->flags = nullFlag;
  1000   1000       cnt--;
................................................................................
  1055   1055     p2 = pOp->p2;
  1056   1056     assert( n>0 && p1>0 && p2>0 );
  1057   1057     assert( p1+n<=p2 || p2+n<=p1 );
  1058   1058   
  1059   1059     pIn1 = &aMem[p1];
  1060   1060     pOut = &aMem[p2];
  1061   1061     while( n-- ){
  1062         -    assert( pOut<=&aMem[p->nMem] );
  1063         -    assert( pIn1<=&aMem[p->nMem] );
         1062  +    assert( pOut<=&aMem[(p->nMem-p->nCursor)] );
         1063  +    assert( pIn1<=&aMem[(p->nMem-p->nCursor)] );
  1064   1064       assert( memIsValid(pIn1) );
  1065   1065       memAboutToChange(p, pOut);
  1066   1066       zMalloc = pOut->zMalloc;
  1067   1067       pOut->zMalloc = 0;
  1068   1068       sqlite3VdbeMemMove(pOut, pIn1);
  1069   1069   #ifdef SQLITE_DEBUG
  1070   1070       if( pOut->pScopyFrom>=&aMem[p1] && pOut->pScopyFrom<&aMem[p1+pOp->p3] ){
................................................................................
  1140   1140   ** row.
  1141   1141   */
  1142   1142   case OP_ResultRow: {
  1143   1143     Mem *pMem;
  1144   1144     int i;
  1145   1145     assert( p->nResColumn==pOp->p2 );
  1146   1146     assert( pOp->p1>0 );
  1147         -  assert( pOp->p1+pOp->p2<=p->nMem+1 );
         1147  +  assert( pOp->p1+pOp->p2<=(p->nMem-p->nCursor)+1 );
  1148   1148   
  1149   1149     /* If this statement has violated immediate foreign key constraints, do
  1150   1150     ** not return the number of rows modified. And do not RELEASE the statement
  1151   1151     ** transaction. It needs to be rolled back.  */
  1152   1152     if( SQLITE_OK!=(rc = sqlite3VdbeCheckFk(p, 0)) ){
  1153   1153       assert( db->flags&SQLITE_CountRows );
  1154   1154       assert( p->usesStmtJournal );
................................................................................
  1414   1414     sqlite3_context ctx;
  1415   1415     sqlite3_value **apVal;
  1416   1416     int n;
  1417   1417   
  1418   1418     n = pOp->p5;
  1419   1419     apVal = p->apArg;
  1420   1420     assert( apVal || n==0 );
  1421         -  assert( pOp->p3>0 && pOp->p3<=p->nMem );
         1421  +  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  1422   1422     pOut = &aMem[pOp->p3];
  1423   1423     memAboutToChange(p, pOut);
  1424   1424   
  1425         -  assert( n==0 || (pOp->p2>0 && pOp->p2+n<=p->nMem+1) );
         1425  +  assert( n==0 || (pOp->p2>0 && pOp->p2+n<=(p->nMem-p->nCursor)+1) );
  1426   1426     assert( pOp->p3<pOp->p2 || pOp->p3>=pOp->p2+n );
  1427   1427     pArg = &aMem[pOp->p2];
  1428   1428     for(i=0; i<n; i++, pArg++){
  1429   1429       assert( memIsValid(pArg) );
  1430   1430       apVal[i] = pArg;
  1431   1431       Deephemeralize(pArg);
  1432   1432       sqlite3VdbeMemStoreType(pArg);
................................................................................
  1950   1950     assert( pKeyInfo!=0 );
  1951   1951     p1 = pOp->p1;
  1952   1952     p2 = pOp->p2;
  1953   1953   #if SQLITE_DEBUG
  1954   1954     if( aPermute ){
  1955   1955       int k, mx = 0;
  1956   1956       for(k=0; k<n; k++) if( aPermute[k]>mx ) mx = aPermute[k];
  1957         -    assert( p1>0 && p1+mx<=p->nMem+1 );
  1958         -    assert( p2>0 && p2+mx<=p->nMem+1 );
         1957  +    assert( p1>0 && p1+mx<=(p->nMem-p->nCursor)+1 );
         1958  +    assert( p2>0 && p2+mx<=(p->nMem-p->nCursor)+1 );
  1959   1959     }else{
  1960         -    assert( p1>0 && p1+n<=p->nMem+1 );
  1961         -    assert( p2>0 && p2+n<=p->nMem+1 );
         1960  +    assert( p1>0 && p1+n<=(p->nMem-p->nCursor)+1 );
         1961  +    assert( p2>0 && p2+n<=(p->nMem-p->nCursor)+1 );
  1962   1962     }
  1963   1963   #endif /* SQLITE_DEBUG */
  1964   1964     for(i=0; i<n; i++){
  1965   1965       idx = aPermute ? aPermute[i] : i;
  1966   1966       assert( memIsValid(&aMem[p1+idx]) );
  1967   1967       assert( memIsValid(&aMem[p2+idx]) );
  1968   1968       REGISTER_TRACE(p1+idx, &aMem[p1+idx]);
................................................................................
  2205   2205   
  2206   2206   
  2207   2207     p1 = pOp->p1;
  2208   2208     p2 = pOp->p2;
  2209   2209     pC = 0;
  2210   2210     memset(&sMem, 0, sizeof(sMem));
  2211   2211     assert( p1<p->nCursor );
  2212         -  assert( pOp->p3>0 && pOp->p3<=p->nMem );
         2212  +  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  2213   2213     pDest = &aMem[pOp->p3];
  2214   2214     memAboutToChange(p, pDest);
  2215   2215     zRec = 0;
  2216   2216   
  2217   2217     /* This block sets the variable payloadSize to be the total number of
  2218   2218     ** bytes in the record.
  2219   2219     **
................................................................................
  2503   2503     char cAff;               /* A single character of affinity */
  2504   2504   
  2505   2505     zAffinity = pOp->p4.z;
  2506   2506     assert( zAffinity!=0 );
  2507   2507     assert( zAffinity[pOp->p2]==0 );
  2508   2508     pIn1 = &aMem[pOp->p1];
  2509   2509     while( (cAff = *(zAffinity++))!=0 ){
  2510         -    assert( pIn1 <= &p->aMem[p->nMem] );
         2510  +    assert( pIn1 <= &p->aMem[(p->nMem-p->nCursor)] );
  2511   2511       assert( memIsValid(pIn1) );
  2512   2512       ExpandBlob(pIn1);
  2513   2513       applyAffinity(pIn1, cAff, encoding);
  2514   2514       pIn1++;
  2515   2515     }
  2516   2516     break;
  2517   2517   }
................................................................................
  2564   2564     ** of the record to data0.
  2565   2565     */
  2566   2566     nData = 0;         /* Number of bytes of data space */
  2567   2567     nHdr = 0;          /* Number of bytes of header space */
  2568   2568     nZero = 0;         /* Number of zero bytes at the end of the record */
  2569   2569     nField = pOp->p1;
  2570   2570     zAffinity = pOp->p4.z;
  2571         -  assert( nField>0 && pOp->p2>0 && pOp->p2+nField<=p->nMem+1 );
         2571  +  assert( nField>0 && pOp->p2>0 && pOp->p2+nField<=(p->nMem-p->nCursor)+1 );
  2572   2572     pData0 = &aMem[nField];
  2573   2573     nField = pOp->p2;
  2574   2574     pLast = &pData0[nField-1];
  2575   2575     file_format = p->minWriteFileFormat;
  2576   2576   
  2577   2577     /* Identify the output register */
  2578   2578     assert( pOp->p3<pOp->p1 || pOp->p3>=pOp->p1+pOp->p2 );
................................................................................
  2630   2630       i += putVarint32(&zNewRecord[i], serial_type);      /* serial type */
  2631   2631     }
  2632   2632     for(pRec=pData0; pRec<=pLast; pRec++){  /* serial data */
  2633   2633       i += sqlite3VdbeSerialPut(&zNewRecord[i], (int)(nByte-i), pRec,file_format);
  2634   2634     }
  2635   2635     assert( i==nByte );
  2636   2636   
  2637         -  assert( pOp->p3>0 && pOp->p3<=p->nMem );
         2637  +  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  2638   2638     pOut->n = (int)nByte;
  2639   2639     pOut->flags = MEM_Blob | MEM_Dyn;
  2640   2640     pOut->xDel = 0;
  2641   2641     if( nZero ){
  2642   2642       pOut->u.nZero = nZero;
  2643   2643       pOut->flags |= MEM_Zero;
  2644   2644     }
................................................................................
  3210   3210         p->minWriteFileFormat = pDb->pSchema->file_format;
  3211   3211       }
  3212   3212     }else{
  3213   3213       wrFlag = 0;
  3214   3214     }
  3215   3215     if( pOp->p5 & OPFLAG_P2ISREG ){
  3216   3216       assert( p2>0 );
  3217         -    assert( p2<=p->nMem );
         3217  +    assert( p2<=(p->nMem-p->nCursor) );
  3218   3218       pIn2 = &aMem[p2];
  3219   3219       assert( memIsValid(pIn2) );
  3220   3220       assert( (pIn2->flags & MEM_Int)!=0 );
  3221   3221       sqlite3VdbeMemIntegerify(pIn2);
  3222   3222       p2 = (int)pIn2->u.i;
  3223   3223       /* The p2 value always comes from a prior OP_CreateTable opcode and
  3224   3224       ** that opcode will always set the p2 value to 2 or more or else fail.
................................................................................
  3747   3747     UnpackedRecord r;                  /* B-Tree index search key */
  3748   3748     i64 R;                             /* Rowid stored in register P3 */
  3749   3749   
  3750   3750     pIn3 = &aMem[pOp->p3];
  3751   3751     aMx = &aMem[pOp->p4.i];
  3752   3752     /* Assert that the values of parameters P1 and P4 are in range. */
  3753   3753     assert( pOp->p4type==P4_INT32 );
  3754         -  assert( pOp->p4.i>0 && pOp->p4.i<=p->nMem );
         3754  +  assert( pOp->p4.i>0 && pOp->p4.i<=(p->nMem-p->nCursor) );
  3755   3755     assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  3756   3756   
  3757   3757     /* Find the index cursor. */
  3758   3758     pCx = p->apCsr[pOp->p1];
  3759   3759     assert( pCx->deferredMoveto==0 );
  3760   3760     pCx->seekResult = 0;
  3761   3761     pCx->cacheStatus = CACHE_STALE;
................................................................................
  3950   3950           if( p->pFrame ){
  3951   3951             for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
  3952   3952             /* Assert that P3 is a valid memory cell. */
  3953   3953             assert( pOp->p3<=pFrame->nMem );
  3954   3954             pMem = &pFrame->aMem[pOp->p3];
  3955   3955           }else{
  3956   3956             /* Assert that P3 is a valid memory cell. */
  3957         -          assert( pOp->p3<=p->nMem );
         3957  +          assert( pOp->p3<=(p->nMem-p->nCursor) );
  3958   3958             pMem = &aMem[pOp->p3];
  3959   3959             memAboutToChange(p, pMem);
  3960   3960           }
  3961   3961           assert( memIsValid(pMem) );
  3962   3962   
  3963   3963           REGISTER_TRACE(pOp->p3, pMem);
  3964   3964           sqlite3VdbeMemIntegerify(pMem);
................................................................................
  4604   4604   case OP_IdxDelete: {
  4605   4605     VdbeCursor *pC;
  4606   4606     BtCursor *pCrsr;
  4607   4607     int res;
  4608   4608     UnpackedRecord r;
  4609   4609   
  4610   4610     assert( pOp->p3>0 );
  4611         -  assert( pOp->p2>0 && pOp->p2+pOp->p3<=p->nMem+1 );
         4611  +  assert( pOp->p2>0 && pOp->p2+pOp->p3<=(p->nMem-p->nCursor)+1 );
  4612   4612     assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  4613   4613     pC = p->apCsr[pOp->p1];
  4614   4614     assert( pC!=0 );
  4615   4615     pCrsr = pC->pCursor;
  4616   4616     if( ALWAYS(pCrsr!=0) ){
  4617   4617       r.pKeyInfo = pC->pKeyInfo;
  4618   4618       r.nField = (u16)pOp->p3;
................................................................................
  4812   4812   ** See also: Destroy
  4813   4813   */
  4814   4814   case OP_Clear: {
  4815   4815     int nChange;
  4816   4816    
  4817   4817     nChange = 0;
  4818   4818     assert( p->readOnly==0 );
         4819  +  assert( pOp->p1!=1 );
  4819   4820     assert( (p->btreeMask & (((yDbMask)1)<<pOp->p2))!=0 );
  4820   4821     rc = sqlite3BtreeClearTable(
  4821   4822         db->aDb[pOp->p2].pBt, pOp->p1, (pOp->p3 ? &nChange : 0)
  4822   4823     );
  4823   4824     if( pOp->p3 ){
  4824   4825       p->nChange += nChange;
  4825   4826       if( pOp->p3>0 ){
................................................................................
  5012   5013     Mem *pnErr;     /* Register keeping track of errors remaining */
  5013   5014   
  5014   5015     assert( p->bIsReader );
  5015   5016     nRoot = pOp->p2;
  5016   5017     assert( nRoot>0 );
  5017   5018     aRoot = sqlite3DbMallocRaw(db, sizeof(int)*(nRoot+1) );
  5018   5019     if( aRoot==0 ) goto no_mem;
  5019         -  assert( pOp->p3>0 && pOp->p3<=p->nMem );
         5020  +  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  5020   5021     pnErr = &aMem[pOp->p3];
  5021   5022     assert( (pnErr->flags & MEM_Int)!=0 );
  5022   5023     assert( (pnErr->flags & (MEM_Str|MEM_Blob))==0 );
  5023   5024     pIn1 = &aMem[pOp->p1];
  5024   5025     for(j=0; j<nRoot; j++){
  5025   5026       aRoot[j] = (int)sqlite3VdbeIntValue(&pIn1[j]);
  5026   5027     }
................................................................................
  5436   5437     for(i=0; i<n; i++, pRec++){
  5437   5438       assert( memIsValid(pRec) );
  5438   5439       apVal[i] = pRec;
  5439   5440       memAboutToChange(p, pRec);
  5440   5441       sqlite3VdbeMemStoreType(pRec);
  5441   5442     }
  5442   5443     ctx.pFunc = pOp->p4.pFunc;
  5443         -  assert( pOp->p3>0 && pOp->p3<=p->nMem );
         5444  +  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  5444   5445     ctx.pMem = pMem = &aMem[pOp->p3];
  5445   5446     pMem->n++;
  5446   5447     ctx.s.flags = MEM_Null;
  5447   5448     ctx.s.z = 0;
  5448   5449     ctx.s.zMalloc = 0;
  5449   5450     ctx.s.xDel = 0;
  5450   5451     ctx.s.db = db;
................................................................................
  5483   5484   ** argument is not used by this opcode.  It is only there to disambiguate
  5484   5485   ** functions that can take varying numbers of arguments.  The
  5485   5486   ** P4 argument is only needed for the degenerate case where
  5486   5487   ** the step function was not previously called.
  5487   5488   */
  5488   5489   case OP_AggFinal: {
  5489   5490     Mem *pMem;
  5490         -  assert( pOp->p1>0 && pOp->p1<=p->nMem );
         5491  +  assert( pOp->p1>0 && pOp->p1<=(p->nMem-p->nCursor) );
  5491   5492     pMem = &aMem[pOp->p1];
  5492   5493     assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
  5493   5494     rc = sqlite3VdbeMemFinalize(pMem, pOp->p4.pFunc);
  5494   5495     if( rc ){
  5495   5496       sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3_value_text(pMem));
  5496   5497     }
  5497   5498     sqlite3VdbeChangeEncoding(pMem, encoding);
................................................................................
  5900   5901     sqlite3_vtab *pVtab;
  5901   5902     const sqlite3_module *pModule;
  5902   5903     Mem *pDest;
  5903   5904     sqlite3_context sContext;
  5904   5905   
  5905   5906     VdbeCursor *pCur = p->apCsr[pOp->p1];
  5906   5907     assert( pCur->pVtabCursor );
  5907         -  assert( pOp->p3>0 && pOp->p3<=p->nMem );
         5908  +  assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) );
  5908   5909     pDest = &aMem[pOp->p3];
  5909   5910     memAboutToChange(p, pDest);
  5910   5911     if( pCur->nullRow ){
  5911   5912       sqlite3VdbeMemSetNull(pDest);
  5912   5913       break;
  5913   5914     }
  5914   5915     pVtab = pCur->pVtabCursor->pVtab;

Changes to src/vdbemem.c.

  1002   1002       p->type = SQLITE_NULL;
  1003   1003       p->db = db;
  1004   1004     }
  1005   1005     return p;
  1006   1006   }
  1007   1007   
  1008   1008   /*
  1009         -** Create a new sqlite3_value object, containing the value of pExpr.
         1009  +** Context object passed by sqlite3Stat4ProbeSetValue() through to 
         1010  +** valueNew(). See comments above valueNew() for details.
         1011  +*/
         1012  +struct ValueNewStat4Ctx {
         1013  +  Parse *pParse;
         1014  +  Index *pIdx;
         1015  +  UnpackedRecord **ppRec;
         1016  +  int iVal;
         1017  +};
         1018  +
         1019  +/*
         1020  +** Allocate and return a pointer to a new sqlite3_value object. If
         1021  +** the second argument to this function is NULL, the object is allocated
         1022  +** by calling sqlite3ValueNew().
         1023  +**
         1024  +** Otherwise, if the second argument is non-zero, then this function is 
         1025  +** being called indirectly by sqlite3Stat4ProbeSetValue(). If it has not
         1026  +** already been allocated, allocate the UnpackedRecord structure that 
         1027  +** that function will return to its caller here. Then return a pointer 
         1028  +** an sqlite3_value within the UnpackedRecord.a[] array.
         1029  +*/
         1030  +static sqlite3_value *valueNew(sqlite3 *db, struct ValueNewStat4Ctx *p){
         1031  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         1032  +  if( p ){
         1033  +    UnpackedRecord *pRec = p->ppRec[0];
         1034  +
         1035  +    if( pRec==0 ){
         1036  +      Index *pIdx = p->pIdx;      /* Index being probed */
         1037  +      int nByte;                  /* Bytes of space to allocate */
         1038  +      int i;                      /* Counter variable */
         1039  +      int nCol = pIdx->nColumn+1; /* Number of index columns including rowid */
         1040  +  
         1041  +      nByte = sizeof(Mem) * nCol + sizeof(UnpackedRecord);
         1042  +      pRec = (UnpackedRecord*)sqlite3DbMallocZero(db, nByte);
         1043  +      if( pRec ){
         1044  +        pRec->pKeyInfo = sqlite3IndexKeyinfo(p->pParse, pIdx);
         1045  +        if( pRec->pKeyInfo ){
         1046  +          assert( pRec->pKeyInfo->nField+1==nCol );
         1047  +          pRec->pKeyInfo->enc = ENC(db);
         1048  +          pRec->flags = UNPACKED_PREFIX_MATCH;
         1049  +          pRec->aMem = (Mem *)&pRec[1];
         1050  +          for(i=0; i<nCol; i++){
         1051  +            pRec->aMem[i].flags = MEM_Null;
         1052  +            pRec->aMem[i].type = SQLITE_NULL;
         1053  +            pRec->aMem[i].db = db;
         1054  +          }
         1055  +        }else{
         1056  +          sqlite3DbFree(db, pRec);
         1057  +          pRec = 0;
         1058  +        }
         1059  +      }
         1060  +      if( pRec==0 ) return 0;
         1061  +      p->ppRec[0] = pRec;
         1062  +    }
         1063  +  
         1064  +    pRec->nField = p->iVal+1;
         1065  +    return &pRec->aMem[p->iVal];
         1066  +  }
         1067  +#endif
         1068  +  return sqlite3ValueNew(db);
         1069  +}
         1070  +
         1071  +/*
         1072  +** Extract a value from the supplied expression in the manner described
         1073  +** above sqlite3ValueFromExpr(). Allocate the sqlite3_value object
         1074  +** using valueNew().
  1010   1075   **
  1011         -** This only works for very simple expressions that consist of one constant
  1012         -** token (i.e. "5", "5.1", "'a string'"). If the expression can
  1013         -** be converted directly into a value, then the value is allocated and
  1014         -** a pointer written to *ppVal. The caller is responsible for deallocating
  1015         -** the value by passing it to sqlite3ValueFree() later on. If the expression
  1016         -** cannot be converted to a value, then *ppVal is set to NULL.
         1076  +** If pCtx is NULL and an error occurs after the sqlite3_value object
         1077  +** has been allocated, it is freed before returning. Or, if pCtx is not
         1078  +** NULL, it is assumed that the caller will free any allocated object
         1079  +** in all cases.
  1017   1080   */
  1018         -int sqlite3ValueFromExpr(
  1019         -  sqlite3 *db,              /* The database connection */
  1020         -  Expr *pExpr,              /* The expression to evaluate */
  1021         -  u8 enc,                   /* Encoding to use */
  1022         -  u8 affinity,              /* Affinity to use */
  1023         -  sqlite3_value **ppVal     /* Write the new value here */
         1081  +int valueFromExpr(
         1082  +  sqlite3 *db,                    /* The database connection */
         1083  +  Expr *pExpr,                    /* The expression to evaluate */
         1084  +  u8 enc,                         /* Encoding to use */
         1085  +  u8 affinity,                    /* Affinity to use */
         1086  +  sqlite3_value **ppVal,          /* Write the new value here */
         1087  +  struct ValueNewStat4Ctx *pCtx   /* Second argument for valueNew() */
  1024   1088   ){
  1025   1089     int op;
  1026   1090     char *zVal = 0;
  1027   1091     sqlite3_value *pVal = 0;
  1028   1092     int negInt = 1;
  1029   1093     const char *zNeg = "";
         1094  +  int rc = SQLITE_OK;
  1030   1095   
  1031   1096     if( !pExpr ){
  1032   1097       *ppVal = 0;
  1033   1098       return SQLITE_OK;
  1034   1099     }
  1035   1100     op = pExpr->op;
  1036   1101   
  1037         -  /* op can only be TK_REGISTER if we have compiled with SQLITE_ENABLE_STAT3.
         1102  +  /* op can only be TK_REGISTER if we have compiled with SQLITE_ENABLE_STAT4.
  1038   1103     ** The ifdef here is to enable us to achieve 100% branch test coverage even
  1039         -  ** when SQLITE_ENABLE_STAT3 is omitted.
         1104  +  ** when SQLITE_ENABLE_STAT4 is omitted.
  1040   1105     */
  1041         -#ifdef SQLITE_ENABLE_STAT3
         1106  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
  1042   1107     if( op==TK_REGISTER ) op = pExpr->op2;
  1043   1108   #else
  1044   1109     if( NEVER(op==TK_REGISTER) ) op = pExpr->op2;
  1045   1110   #endif
  1046   1111   
  1047   1112     /* Handle negative integers in a single step.  This is needed in the
  1048   1113     ** case when the value is -9223372036854775808.
................................................................................
  1052   1117       pExpr = pExpr->pLeft;
  1053   1118       op = pExpr->op;
  1054   1119       negInt = -1;
  1055   1120       zNeg = "-";
  1056   1121     }
  1057   1122   
  1058   1123     if( op==TK_STRING || op==TK_FLOAT || op==TK_INTEGER ){
  1059         -    pVal = sqlite3ValueNew(db);
         1124  +    pVal = valueNew(db, pCtx);
  1060   1125       if( pVal==0 ) goto no_mem;
  1061   1126       if( ExprHasProperty(pExpr, EP_IntValue) ){
  1062   1127         sqlite3VdbeMemSetInt64(pVal, (i64)pExpr->u.iValue*negInt);
  1063   1128       }else{
  1064   1129         zVal = sqlite3MPrintf(db, "%s%s", zNeg, pExpr->u.zToken);
  1065   1130         if( zVal==0 ) goto no_mem;
  1066   1131         sqlite3ValueSetStr(pVal, -1, zVal, SQLITE_UTF8, SQLITE_DYNAMIC);
................................................................................
  1069   1134       if( (op==TK_INTEGER || op==TK_FLOAT ) && affinity==SQLITE_AFF_NONE ){
  1070   1135         sqlite3ValueApplyAffinity(pVal, SQLITE_AFF_NUMERIC, SQLITE_UTF8);
  1071   1136       }else{
  1072   1137         sqlite3ValueApplyAffinity(pVal, affinity, SQLITE_UTF8);
  1073   1138       }
  1074   1139       if( pVal->flags & (MEM_Int|MEM_Real) ) pVal->flags &= ~MEM_Str;
  1075   1140       if( enc!=SQLITE_UTF8 ){
  1076         -      sqlite3VdbeChangeEncoding(pVal, enc);
         1141  +      rc = sqlite3VdbeChangeEncoding(pVal, enc);
  1077   1142       }
  1078   1143     }else if( op==TK_UMINUS ) {
  1079   1144       /* This branch happens for multiple negative signs.  Ex: -(-5) */
  1080         -    if( SQLITE_OK==sqlite3ValueFromExpr(db,pExpr->pLeft,enc,affinity,&pVal) ){
         1145  +    if( SQLITE_OK==sqlite3ValueFromExpr(db,pExpr->pLeft,enc,affinity,&pVal) 
         1146  +     && pVal!=0
         1147  +    ){
  1081   1148         sqlite3VdbeMemNumerify(pVal);
  1082   1149         if( pVal->u.i==SMALLEST_INT64 ){
  1083   1150           pVal->flags &= MEM_Int;
  1084   1151           pVal->flags |= MEM_Real;
  1085   1152           pVal->r = (double)LARGEST_INT64;
  1086   1153         }else{
  1087   1154           pVal->u.i = -pVal->u.i;
  1088   1155         }
  1089   1156         pVal->r = -pVal->r;
  1090   1157         sqlite3ValueApplyAffinity(pVal, affinity, enc);
  1091   1158       }
  1092   1159     }else if( op==TK_NULL ){
  1093         -    pVal = sqlite3ValueNew(db);
         1160  +    pVal = valueNew(db, pCtx);
  1094   1161       if( pVal==0 ) goto no_mem;
  1095   1162     }
  1096   1163   #ifndef SQLITE_OMIT_BLOB_LITERAL
  1097   1164     else if( op==TK_BLOB ){
  1098   1165       int nVal;
  1099   1166       assert( pExpr->u.zToken[0]=='x' || pExpr->u.zToken[0]=='X' );
  1100   1167       assert( pExpr->u.zToken[1]=='\'' );
  1101         -    pVal = sqlite3ValueNew(db);
         1168  +    pVal = valueNew(db, pCtx);
  1102   1169       if( !pVal ) goto no_mem;
  1103   1170       zVal = &pExpr->u.zToken[2];
  1104   1171       nVal = sqlite3Strlen30(zVal)-1;
  1105   1172       assert( zVal[nVal]=='\'' );
  1106   1173       sqlite3VdbeMemSetStr(pVal, sqlite3HexToBlob(db, zVal, nVal), nVal/2,
  1107   1174                            0, SQLITE_DYNAMIC);
  1108   1175     }
  1109   1176   #endif
  1110   1177   
  1111   1178     if( pVal ){
  1112   1179       sqlite3VdbeMemStoreType(pVal);
  1113   1180     }
  1114   1181     *ppVal = pVal;
  1115         -  return SQLITE_OK;
         1182  +  return rc;
  1116   1183   
  1117   1184   no_mem:
  1118   1185     db->mallocFailed = 1;
  1119   1186     sqlite3DbFree(db, zVal);
  1120         -  sqlite3ValueFree(pVal);
  1121         -  *ppVal = 0;
         1187  +  assert( *ppVal==0 );
         1188  +  if( pCtx==0 ) sqlite3ValueFree(pVal);
  1122   1189     return SQLITE_NOMEM;
  1123   1190   }
  1124   1191   
         1192  +/*
         1193  +** Create a new sqlite3_value object, containing the value of pExpr.
         1194  +**
         1195  +** This only works for very simple expressions that consist of one constant
         1196  +** token (i.e. "5", "5.1", "'a string'"). If the expression can
         1197  +** be converted directly into a value, then the value is allocated and
         1198  +** a pointer written to *ppVal. The caller is responsible for deallocating
         1199  +** the value by passing it to sqlite3ValueFree() later on. If the expression
         1200  +** cannot be converted to a value, then *ppVal is set to NULL.
         1201  +*/
         1202  +int sqlite3ValueFromExpr(
         1203  +  sqlite3 *db,              /* The database connection */
         1204  +  Expr *pExpr,              /* The expression to evaluate */
         1205  +  u8 enc,                   /* Encoding to use */
         1206  +  u8 affinity,              /* Affinity to use */
         1207  +  sqlite3_value **ppVal     /* Write the new value here */
         1208  +){
         1209  +  return valueFromExpr(db, pExpr, enc, affinity, ppVal, 0);
         1210  +}
         1211  +
         1212  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         1213  +/*
         1214  +** The implementation of the sqlite_record() function. This function accepts
         1215  +** a single argument of any type. The return value is a formatted database 
         1216  +** record (a blob) containing the argument value.
         1217  +**
         1218  +** This is used to convert the value stored in the 'sample' column of the
         1219  +** sqlite_stat3 table to the record format SQLite uses internally.
         1220  +*/
         1221  +static void recordFunc(
         1222  +  sqlite3_context *context,
         1223  +  int argc,
         1224  +  sqlite3_value **argv
         1225  +){
         1226  +  const int file_format = 1;
         1227  +  int iSerial;                    /* Serial type */
         1228  +  int nSerial;                    /* Bytes of space for iSerial as varint */
         1229  +  int nVal;                       /* Bytes of space required for argv[0] */
         1230  +  int nRet;
         1231  +  sqlite3 *db;
         1232  +  u8 *aRet;
         1233  +
         1234  +  iSerial = sqlite3VdbeSerialType(argv[0], file_format);
         1235  +  nSerial = sqlite3VarintLen(iSerial);
         1236  +  nVal = sqlite3VdbeSerialTypeLen(iSerial);
         1237  +  db = sqlite3_context_db_handle(context);
         1238  +
         1239  +  nRet = 1 + nSerial + nVal;
         1240  +  aRet = sqlite3DbMallocRaw(db, nRet);
         1241  +  if( aRet==0 ){
         1242  +    sqlite3_result_error_nomem(context);
         1243  +  }else{
         1244  +    aRet[0] = nSerial+1;
         1245  +    sqlite3PutVarint(&aRet[1], iSerial);
         1246  +    sqlite3VdbeSerialPut(&aRet[1+nSerial], nVal, argv[0], file_format);
         1247  +    sqlite3_result_blob(context, aRet, nRet, SQLITE_TRANSIENT);
         1248  +    sqlite3DbFree(db, aRet);
         1249  +  }
         1250  +}
         1251  +
         1252  +/*
         1253  +** Register built-in functions used to help read ANALYZE data.
         1254  +*/
         1255  +void sqlite3AnalyzeFunctions(void){
         1256  +  static SQLITE_WSD FuncDef aAnalyzeTableFuncs[] = {
         1257  +    FUNCTION(sqlite_record,   1, 0, 0, recordFunc),
         1258  +  };
         1259  +  int i;
         1260  +  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
         1261  +  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aAnalyzeTableFuncs);
         1262  +  for(i=0; i<ArraySize(aAnalyzeTableFuncs); i++){
         1263  +    sqlite3FuncDefInsert(pHash, &aFunc[i]);
         1264  +  }
         1265  +}
         1266  +
         1267  +/*
         1268  +** This function is used to allocate and populate UnpackedRecord 
         1269  +** structures intended to be compared against sample index keys stored 
         1270  +** in the sqlite_stat4 table.
         1271  +**
         1272  +** A single call to this function attempts to populates field iVal (leftmost 
         1273  +** is 0 etc.) of the unpacked record with a value extracted from expression
         1274  +** pExpr. Extraction of values is possible if:
         1275  +**
         1276  +**  * (pExpr==0). In this case the value is assumed to be an SQL NULL,
         1277  +**
         1278  +**  * The expression is a bound variable, and this is a reprepare, or
         1279  +**
         1280  +**  * The sqlite3ValueFromExpr() function is able to extract a value 
         1281  +**    from the expression (i.e. the expression is a literal value).
         1282  +**
         1283  +** If a value can be extracted, the affinity passed as the 5th argument
         1284  +** is applied to it before it is copied into the UnpackedRecord. Output
         1285  +** parameter *pbOk is set to true if a value is extracted, or false 
         1286  +** otherwise.
         1287  +**
         1288  +** When this function is called, *ppRec must either point to an object
         1289  +** allocated by an earlier call to this function, or must be NULL. If it
         1290  +** is NULL and a value can be successfully extracted, a new UnpackedRecord
         1291  +** is allocated (and *ppRec set to point to it) before returning.
         1292  +**
         1293  +** Unless an error is encountered, SQLITE_OK is returned. It is not an
         1294  +** error if a value cannot be extracted from pExpr. If an error does
         1295  +** occur, an SQLite error code is returned.
         1296  +*/
         1297  +int sqlite3Stat4ProbeSetValue(
         1298  +  Parse *pParse,                  /* Parse context */
         1299  +  Index *pIdx,                    /* Index being probed */
         1300  +  UnpackedRecord **ppRec,         /* IN/OUT: Probe record */
         1301  +  Expr *pExpr,                    /* The expression to extract a value from */
         1302  +  u8 affinity,                    /* Affinity to use */
         1303  +  int iVal,                       /* Array element to populate */
         1304  +  int *pbOk                       /* OUT: True if value was extracted */
         1305  +){
         1306  +  int rc = SQLITE_OK;
         1307  +  sqlite3_value *pVal = 0;
         1308  +
         1309  +  struct ValueNewStat4Ctx alloc;
         1310  +  alloc.pParse = pParse;
         1311  +  alloc.pIdx = pIdx;
         1312  +  alloc.ppRec = ppRec;
         1313  +  alloc.iVal = iVal;
         1314  +
         1315  +  if( !pExpr ){
         1316  +    pVal = valueNew(pParse->db, &alloc);
         1317  +    if( pVal ){
         1318  +      sqlite3VdbeMemSetNull((Mem*)pVal);
         1319  +      *pbOk = 1;
         1320  +    }
         1321  +  }else if( pExpr->op==TK_VARIABLE
         1322  +        || (pExpr->op==TK_REGISTER && pExpr->op2==TK_VARIABLE)
         1323  +  ){
         1324  +    Vdbe *v;
         1325  +    int iBindVar = pExpr->iColumn;
         1326  +    sqlite3VdbeSetVarmask(pParse->pVdbe, iBindVar);
         1327  +    if( (v = pParse->pReprepare)!=0 ){
         1328  +      pVal = valueNew(pParse->db, &alloc);
         1329  +      if( pVal ){
         1330  +        rc = sqlite3VdbeMemCopy((Mem*)pVal, &v->aVar[iBindVar-1]);
         1331  +        if( rc==SQLITE_OK ){
         1332  +          sqlite3ValueApplyAffinity(pVal, affinity, SQLITE_UTF8);
         1333  +        }
         1334  +        pVal->db = pParse->db;
         1335  +        *pbOk = 1;
         1336  +        sqlite3VdbeMemStoreType((Mem*)pVal);
         1337  +      }
         1338  +    }else{
         1339  +      *pbOk = 0;
         1340  +    }
         1341  +  }else{
         1342  +    sqlite3 *db = pParse->db;
         1343  +    rc = valueFromExpr(db, pExpr, ENC(db), affinity, &pVal, &alloc);
         1344  +    *pbOk = (pVal!=0);
         1345  +  }
         1346  +
         1347  +  assert( pVal==0 || pVal->db==pParse->db );
         1348  +  return rc;
         1349  +}
         1350  +
         1351  +/*
         1352  +** Unless it is NULL, the argument must be an UnpackedRecord object returned
         1353  +** by an earlier call to sqlite3Stat4ProbeSetValue(). This call deletes
         1354  +** the object.
         1355  +*/
         1356  +void sqlite3Stat4ProbeFree(UnpackedRecord *pRec){
         1357  +  if( pRec ){
         1358  +    int i;
         1359  +    int nCol = pRec->pKeyInfo->nField+1;
         1360  +    Mem *aMem = pRec->aMem;
         1361  +    sqlite3 *db = aMem[0].db;
         1362  +    for(i=0; i<nCol; i++){
         1363  +      sqlite3DbFree(db, aMem[i].zMalloc);
         1364  +    }
         1365  +    sqlite3DbFree(db, pRec->pKeyInfo);
         1366  +    sqlite3DbFree(db, pRec);
         1367  +  }
         1368  +}
         1369  +#endif /* ifdef SQLITE_ENABLE_STAT4 */
         1370  +
  1125   1371   /*
  1126   1372   ** Change the string value of an sqlite3_value object
  1127   1373   */
  1128   1374   void sqlite3ValueSetStr(
  1129   1375     sqlite3_value *v,     /* Value to be set */
  1130   1376     int n,                /* Length of string z */
  1131   1377     const void *z,        /* Text of the new string */

Changes to src/where.c.

   281    281   #define TERM_DYNAMIC    0x01   /* Need to call sqlite3ExprDelete(db, pExpr) */
   282    282   #define TERM_VIRTUAL    0x02   /* Added by the optimizer.  Do not code */
   283    283   #define TERM_CODED      0x04   /* This term is already coded */
   284    284   #define TERM_COPIED     0x08   /* Has a child */
   285    285   #define TERM_ORINFO     0x10   /* Need to free the WhereTerm.u.pOrInfo object */
   286    286   #define TERM_ANDINFO    0x20   /* Need to free the WhereTerm.u.pAndInfo obj */
   287    287   #define TERM_OR_OK      0x40   /* Used during OR-clause processing */
   288         -#ifdef SQLITE_ENABLE_STAT3
          288  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
   289    289   #  define TERM_VNULL    0x80   /* Manufactured x>NULL or x<=NULL term */
   290    290   #else
   291    291   #  define TERM_VNULL    0x00   /* Disabled if not using stat3 */
   292    292   #endif
   293    293   
   294    294   /*
   295    295   ** An instance of the WhereScan object is used as an iterator for locating
................................................................................
   387    387   */
   388    388   struct WhereLoopBuilder {
   389    389     WhereInfo *pWInfo;        /* Information about this WHERE */
   390    390     WhereClause *pWC;         /* WHERE clause terms */
   391    391     ExprList *pOrderBy;       /* ORDER BY clause */
   392    392     WhereLoop *pNew;          /* Template WhereLoop */
   393    393     WhereOrSet *pOrSet;       /* Record best loops here, if not NULL */
          394  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
          395  +  UnpackedRecord *pRec;     /* Probe for stat4 (if required) */
          396  +  int nRecValid;            /* Number of valid fields currently in pRec */
          397  +#endif
   394    398   };
   395    399   
   396    400   /*
   397    401   ** The WHERE clause processing routine has two halves.  The
   398    402   ** first part does the start of the WHERE loop and the second
   399    403   ** half does the tail of the WHERE loop.  An instance of
   400    404   ** this structure is returned by the first half and passed
................................................................................
  1781   1785         pTerm->nChild = 1;
  1782   1786         pTerm->wtFlags |= TERM_COPIED;
  1783   1787         pNewTerm->prereqAll = pTerm->prereqAll;
  1784   1788       }
  1785   1789     }
  1786   1790   #endif /* SQLITE_OMIT_VIRTUALTABLE */
  1787   1791   
  1788         -#ifdef SQLITE_ENABLE_STAT3
         1792  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
  1789   1793     /* When sqlite_stat3 histogram data is available an operator of the
  1790   1794     ** form "x IS NOT NULL" can sometimes be evaluated more efficiently
  1791   1795     ** as "x>NULL" if x is not an INTEGER PRIMARY KEY.  So construct a
  1792   1796     ** virtual term of that form.
  1793   1797     **
  1794   1798     ** Note that the virtual term must be tagged with TERM_VNULL.  This
  1795   1799     ** TERM_VNULL tag will suppress the not-null check at the beginning
................................................................................
  2389   2393     }
  2390   2394   
  2391   2395     return pParse->nErr;
  2392   2396   }
  2393   2397   #endif /* !defined(SQLITE_OMIT_VIRTUALTABLE) */
  2394   2398   
  2395   2399   
  2396         -#ifdef SQLITE_ENABLE_STAT3
         2400  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
  2397   2401   /*
  2398   2402   ** Estimate the location of a particular key among all keys in an
  2399   2403   ** index.  Store the results in aStat as follows:
  2400   2404   **
  2401   2405   **    aStat[0]      Est. number of rows less than pVal
  2402   2406   **    aStat[1]      Est. number of rows equal to pVal
  2403   2407   **
  2404   2408   ** Return SQLITE_OK on success.
  2405   2409   */
  2406         -static int whereKeyStats(
         2410  +static void whereKeyStats(
  2407   2411     Parse *pParse,              /* Database connection */
  2408   2412     Index *pIdx,                /* Index to consider domain of */
  2409         -  sqlite3_value *pVal,        /* Value to consider */
         2413  +  UnpackedRecord *pRec,       /* Vector of values to consider */
  2410   2414     int roundUp,                /* Round up if true.  Round down if false */
  2411   2415     tRowcnt *aStat              /* OUT: stats written here */
  2412   2416   ){
  2413         -  tRowcnt n;
  2414         -  IndexSample *aSample;
  2415         -  int i, eType;
  2416         -  int isEq = 0;
  2417         -  i64 v;
  2418         -  double r, rS;
  2419         -
  2420         -  assert( roundUp==0 || roundUp==1 );
  2421         -  assert( pIdx->nSample>0 );
  2422         -  if( pVal==0 ) return SQLITE_ERROR;
  2423         -  n = pIdx->aiRowEst[0];
  2424         -  aSample = pIdx->aSample;
  2425         -  eType = sqlite3_value_type(pVal);
  2426         -
  2427         -  if( eType==SQLITE_INTEGER ){
  2428         -    v = sqlite3_value_int64(pVal);
  2429         -    r = (i64)v;
  2430         -    for(i=0; i<pIdx->nSample; i++){
  2431         -      if( aSample[i].eType==SQLITE_NULL ) continue;
  2432         -      if( aSample[i].eType>=SQLITE_TEXT ) break;
  2433         -      if( aSample[i].eType==SQLITE_INTEGER ){
  2434         -        if( aSample[i].u.i>=v ){
  2435         -          isEq = aSample[i].u.i==v;
  2436         -          break;
  2437         -        }
  2438         -      }else{
  2439         -        assert( aSample[i].eType==SQLITE_FLOAT );
  2440         -        if( aSample[i].u.r>=r ){
  2441         -          isEq = aSample[i].u.r==r;
  2442         -          break;
  2443         -        }
  2444         -      }
  2445         -    }
  2446         -  }else if( eType==SQLITE_FLOAT ){
  2447         -    r = sqlite3_value_double(pVal);
  2448         -    for(i=0; i<pIdx->nSample; i++){
  2449         -      if( aSample[i].eType==SQLITE_NULL ) continue;
  2450         -      if( aSample[i].eType>=SQLITE_TEXT ) break;
  2451         -      if( aSample[i].eType==SQLITE_FLOAT ){
  2452         -        rS = aSample[i].u.r;
  2453         -      }else{
  2454         -        rS = aSample[i].u.i;
  2455         -      }
  2456         -      if( rS>=r ){
  2457         -        isEq = rS==r;
  2458         -        break;
  2459         -      }
  2460         -    }
  2461         -  }else if( eType==SQLITE_NULL ){
  2462         -    i = 0;
  2463         -    if( aSample[0].eType==SQLITE_NULL ) isEq = 1;
  2464         -  }else{
  2465         -    assert( eType==SQLITE_TEXT || eType==SQLITE_BLOB );
  2466         -    for(i=0; i<pIdx->nSample; i++){
  2467         -      if( aSample[i].eType==SQLITE_TEXT || aSample[i].eType==SQLITE_BLOB ){
  2468         -        break;
  2469         -      }
  2470         -    }
  2471         -    if( i<pIdx->nSample ){      
  2472         -      sqlite3 *db = pParse->db;
  2473         -      CollSeq *pColl;
  2474         -      const u8 *z;
  2475         -      if( eType==SQLITE_BLOB ){
  2476         -        z = (const u8 *)sqlite3_value_blob(pVal);
  2477         -        pColl = db->pDfltColl;
  2478         -        assert( pColl->enc==SQLITE_UTF8 );
  2479         -      }else{
  2480         -        pColl = sqlite3GetCollSeq(pParse, SQLITE_UTF8, 0, *pIdx->azColl);
  2481         -        /* If the collating sequence was unavailable, we should have failed
  2482         -        ** long ago and never reached this point.  But we'll check just to
  2483         -        ** be doubly sure. */
  2484         -        if( NEVER(pColl==0) ) return SQLITE_ERROR;
  2485         -        z = (const u8 *)sqlite3ValueText(pVal, pColl->enc);
  2486         -        if( !z ){
  2487         -          return SQLITE_NOMEM;
  2488         -        }
  2489         -        assert( z && pColl && pColl->xCmp );
  2490         -      }
  2491         -      n = sqlite3ValueBytes(pVal, pColl->enc);
  2492         -  
  2493         -      for(; i<pIdx->nSample; i++){
  2494         -        int c;
  2495         -        int eSampletype = aSample[i].eType;
  2496         -        if( eSampletype<eType ) continue;
  2497         -        if( eSampletype!=eType ) break;
  2498         -#ifndef SQLITE_OMIT_UTF16
  2499         -        if( pColl->enc!=SQLITE_UTF8 ){
  2500         -          int nSample;
  2501         -          char *zSample = sqlite3Utf8to16(
  2502         -              db, pColl->enc, aSample[i].u.z, aSample[i].nByte, &nSample
  2503         -          );
  2504         -          if( !zSample ){
  2505         -            assert( db->mallocFailed );
  2506         -            return SQLITE_NOMEM;
  2507         -          }
  2508         -          c = pColl->xCmp(pColl->pUser, nSample, zSample, n, z);
  2509         -          sqlite3DbFree(db, zSample);
  2510         -        }else
  2511         -#endif
  2512         -        {
  2513         -          c = pColl->xCmp(pColl->pUser, aSample[i].nByte, aSample[i].u.z, n, z);
  2514         -        }
  2515         -        if( c>=0 ){
  2516         -          if( c==0 ) isEq = 1;
  2517         -          break;
  2518         -        }
  2519         -      }
  2520         -    }
  2521         -  }
  2522         -
  2523         -  /* At this point, aSample[i] is the first sample that is greater than
  2524         -  ** or equal to pVal.  Or if i==pIdx->nSample, then all samples are less
  2525         -  ** than pVal.  If aSample[i]==pVal, then isEq==1.
  2526         -  */
  2527         -  if( isEq ){
  2528         -    assert( i<pIdx->nSample );
  2529         -    aStat[0] = aSample[i].nLt;
  2530         -    aStat[1] = aSample[i].nEq;
         2417  +  IndexSample *aSample = pIdx->aSample;
         2418  +  int iCol = pRec->nField-1;  /* Index of required stats in anEq[] etc. */
         2419  +  int iMin = 0;               /* Smallest sample not yet tested */
         2420  +  int i = pIdx->nSample;      /* Smallest sample larger than or equal to pRec */
         2421  +  int iTest;                  /* Next sample to test */
         2422  +  int res;                    /* Result of comparison operation */
         2423  +
         2424  +  assert( pIdx->nSample>0 );
         2425  +  assert( pRec->nField>0 && iCol<pIdx->nSampleCol );
         2426  +  do{
         2427  +    iTest = (iMin+i)/2;
         2428  +    res = sqlite3VdbeRecordCompare(aSample[iTest].n, aSample[iTest].p, pRec);
         2429  +    if( res<0 ){
         2430  +      iMin = iTest+1;
         2431  +    }else{
         2432  +      i = iTest;
         2433  +    }
         2434  +  }while( res && iMin<i );
         2435  +
         2436  +#ifdef SQLITE_DEBUG
         2437  +  /* The following assert statements check that the binary search code
         2438  +  ** above found the right answer. This block serves no purpose other
         2439  +  ** than to invoke the asserts.  */
         2440  +  if( res==0 ){
         2441  +    /* If (res==0) is true, then sample $i must be equal to pRec */
         2442  +    assert( i<pIdx->nSample );
         2443  +    assert( 0==sqlite3VdbeRecordCompare(aSample[i].n, aSample[i].p, pRec)
         2444  +         || pParse->db->mallocFailed );
         2445  +  }else{
         2446  +    /* Otherwise, pRec must be smaller than sample $i and larger than
         2447  +    ** sample ($i-1).  */
         2448  +    assert( i==pIdx->nSample 
         2449  +         || sqlite3VdbeRecordCompare(aSample[i].n, aSample[i].p, pRec)>0
         2450  +         || pParse->db->mallocFailed );
         2451  +    assert( i==0
         2452  +         || sqlite3VdbeRecordCompare(aSample[i-1].n, aSample[i-1].p, pRec)<0
         2453  +         || pParse->db->mallocFailed );
         2454  +  }
         2455  +#endif /* ifdef SQLITE_DEBUG */
         2456  +
         2457  +  /* At this point, aSample[i] is the first sample that is greater than
         2458  +  ** or equal to pVal.  Or if i==pIdx->nSample, then all samples are less
         2459  +  ** than pVal.  If aSample[i]==pVal, then res==0.
         2460  +  */
         2461  +  if( res==0 ){
         2462  +    aStat[0] = aSample[i].anLt[iCol];
         2463  +    aStat[1] = aSample[i].anEq[iCol];
  2531   2464     }else{
  2532   2465       tRowcnt iLower, iUpper, iGap;
  2533   2466       if( i==0 ){
  2534   2467         iLower = 0;
  2535         -      iUpper = aSample[0].nLt;
         2468  +      iUpper = aSample[0].anLt[iCol];
  2536   2469       }else{
  2537         -      iUpper = i>=pIdx->nSample ? n : aSample[i].nLt;
  2538         -      iLower = aSample[i-1].nEq + aSample[i-1].nLt;
         2470  +      iUpper = i>=pIdx->nSample ? pIdx->aiRowEst[0] : aSample[i].anLt[iCol];
         2471  +      iLower = aSample[i-1].anEq[iCol] + aSample[i-1].anLt[iCol];
  2539   2472       }
  2540         -    aStat[1] = pIdx->avgEq;
         2473  +    aStat[1] = (pIdx->nColumn>iCol ? pIdx->aAvgEq[iCol] : 1);
  2541   2474       if( iLower>=iUpper ){
  2542   2475         iGap = 0;
  2543   2476       }else{
  2544   2477         iGap = iUpper - iLower;
  2545   2478       }
  2546   2479       if( roundUp ){
  2547   2480         iGap = (iGap*2)/3;
  2548   2481       }else{
  2549   2482         iGap = iGap/3;
  2550   2483       }
  2551   2484       aStat[0] = iLower + iGap;
  2552   2485     }
  2553         -  return SQLITE_OK;
  2554   2486   }
  2555         -#endif /* SQLITE_ENABLE_STAT3 */
  2556         -
  2557         -/*
  2558         -** If expression pExpr represents a literal value, set *pp to point to
  2559         -** an sqlite3_value structure containing the same value, with affinity
  2560         -** aff applied to it, before returning. It is the responsibility of the 
  2561         -** caller to eventually release this structure by passing it to 
  2562         -** sqlite3ValueFree().
  2563         -**
  2564         -** If the current parse is a recompile (sqlite3Reprepare()) and pExpr
  2565         -** is an SQL variable that currently has a non-NULL value bound to it,
  2566         -** create an sqlite3_value structure containing this value, again with
  2567         -** affinity aff applied to it, instead.
  2568         -**
  2569         -** If neither of the above apply, set *pp to NULL.
  2570         -**
  2571         -** If an error occurs, return an error code. Otherwise, SQLITE_OK.
  2572         -*/
  2573         -#ifdef SQLITE_ENABLE_STAT3
  2574         -static int valueFromExpr(
  2575         -  Parse *pParse, 
  2576         -  Expr *pExpr, 
  2577         -  u8 aff, 
  2578         -  sqlite3_value **pp
  2579         -){
  2580         -  if( pExpr->op==TK_VARIABLE
  2581         -   || (pExpr->op==TK_REGISTER && pExpr->op2==TK_VARIABLE)
  2582         -  ){
  2583         -    int iVar = pExpr->iColumn;
  2584         -    sqlite3VdbeSetVarmask(pParse->pVdbe, iVar);
  2585         -    *pp = sqlite3VdbeGetBoundValue(pParse->pReprepare, iVar, aff);
  2586         -    return SQLITE_OK;
  2587         -  }
  2588         -  return sqlite3ValueFromExpr(pParse->db, pExpr, SQLITE_UTF8, aff, pp);
  2589         -}
  2590         -#endif
         2487  +#endif /* SQLITE_ENABLE_STAT4 */
  2591   2488   
  2592   2489   /*
  2593   2490   ** This function is used to estimate the number of rows that will be visited
  2594   2491   ** by scanning an index for a range of values. The range may have an upper
  2595   2492   ** bound, a lower bound, or both. The WHERE clause terms that set the upper
  2596   2493   ** and lower bounds are represented by pLower and pUpper respectively. For
  2597   2494   ** example, assuming that index p is on t1(a):
................................................................................
  2600   2497   **                    |_____|   |_____|
  2601   2498   **                       |         |
  2602   2499   **                     pLower    pUpper
  2603   2500   **
  2604   2501   ** If either of the upper or lower bound is not present, then NULL is passed in
  2605   2502   ** place of the corresponding WhereTerm.
  2606   2503   **
  2607         -** The nEq parameter is passed the index of the index column subject to the
  2608         -** range constraint. Or, equivalently, the number of equality constraints
  2609         -** optimized by the proposed index scan. For example, assuming index p is
  2610         -** on t1(a, b), and the SQL query is:
         2504  +** The value in (pBuilder->pNew->u.btree.nEq) is the index of the index
         2505  +** column subject to the range constraint. Or, equivalently, the number of
         2506  +** equality constraints optimized by the proposed index scan. For example,
         2507  +** assuming index p is on t1(a, b), and the SQL query is:
  2611   2508   **
  2612   2509   **   ... FROM t1 WHERE a = ? AND b > ? AND b < ? ...
  2613   2510   **
  2614         -** then nEq should be passed the value 1 (as the range restricted column,
  2615         -** b, is the second left-most column of the index). Or, if the query is:
         2511  +** then nEq is set to 1 (as the range restricted column, b, is the second 
         2512  +** left-most column of the index). Or, if the query is:
  2616   2513   **
  2617   2514   **   ... FROM t1 WHERE a > ? AND a < ? ...
  2618   2515   **
  2619         -** then nEq should be passed 0.
         2516  +** then nEq is set to 0.
  2620   2517   **
  2621         -** The returned value is an integer divisor to reduce the estimated
  2622         -** search space.  A return value of 1 means that range constraints are
  2623         -** no help at all.  A return value of 2 means range constraints are
  2624         -** expected to reduce the search space by half.  And so forth...
  2625         -**
  2626         -** In the absence of sqlite_stat3 ANALYZE data, each range inequality
  2627         -** reduces the search space by a factor of 4.  Hence a single constraint (x>?)
  2628         -** results in a return of 4 and a range constraint (x>? AND x<?) results
  2629         -** in a return of 16.
         2518  +** When this function is called, *pnOut is set to the whereCost() of the
         2519  +** number of rows that the index scan is expected to visit without 
         2520  +** considering the range constraints. If nEq is 0, this is the number of 
         2521  +** rows in the index. Assuming no error occurs, *pnOut is adjusted (reduced)
         2522  +** to account for the range contraints pLower and pUpper.
         2523  +** 
         2524  +** In the absence of sqlite_stat4 ANALYZE data, or if such data cannot be
         2525  +** used, each range inequality reduces the search space by a factor of 4. 
         2526  +** Hence a pair of constraints (x>? AND x<?) reduces the expected number of
         2527  +** rows visited by a factor of 16.
  2630   2528   */
  2631   2529   static int whereRangeScanEst(
  2632   2530     Parse *pParse,       /* Parsing & code generating context */
  2633         -  Index *p,            /* The index containing the range-compared column; "x" */
  2634         -  int nEq,             /* index into p->aCol[] of the range-compared column */
         2531  +  WhereLoopBuilder *pBuilder,
  2635   2532     WhereTerm *pLower,   /* Lower bound on the range. ex: "x>123" Might be NULL */
  2636   2533     WhereTerm *pUpper,   /* Upper bound on the range. ex: "x<455" Might be NULL */
  2637         -  WhereCost *pRangeDiv /* OUT: Reduce search space by this divisor */
         2534  +  WhereCost *pnOut     /* IN/OUT: Number of rows visited */
  2638   2535   ){
  2639   2536     int rc = SQLITE_OK;
         2537  +  int nOut = (int)*pnOut;
  2640   2538   
  2641         -#ifdef SQLITE_ENABLE_STAT3
         2539  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         2540  +  Index *p = pBuilder->pNew->u.btree.pIndex;
         2541  +  int nEq = pBuilder->pNew->u.btree.nEq;
  2642   2542   
  2643         -  if( nEq==0 && p->nSample && OptimizationEnabled(pParse->db, SQLITE_Stat3) ){
  2644         -    sqlite3_value *pRangeVal;
  2645         -    tRowcnt iLower = 0;
  2646         -    tRowcnt iUpper = p->aiRowEst[0];
         2543  +  if( nEq==pBuilder->nRecValid
         2544  +   && nEq<p->nSampleCol
         2545  +   && p->nSample 
         2546  +   && OptimizationEnabled(pParse->db, SQLITE_Stat3) 
         2547  +  ){
         2548  +    UnpackedRecord *pRec = pBuilder->pRec;
  2647   2549       tRowcnt a[2];
  2648   2550       u8 aff = p->pTable->aCol[p->aiColumn[0]].affinity;
  2649   2551   
         2552  +    /* Variable iLower will be set to the estimate of the number of rows in 
         2553  +    ** the index that are less than the lower bound of the range query. The
         2554  +    ** lower bound being the concatenation of $P and $L, where $P is the
         2555  +    ** key-prefix formed by the nEq values matched against the nEq left-most
         2556  +    ** columns of the index, and $L is the value in pLower.
         2557  +    **
         2558  +    ** Or, if pLower is NULL or $L cannot be extracted from it (because it
         2559  +    ** is not a simple variable or literal value), the lower bound of the
         2560  +    ** range is $P. Due to a quirk in the way whereKeyStats() works, even
         2561  +    ** if $L is available, whereKeyStats() is called for both ($P) and 
         2562  +    ** ($P:$L) and the larger of the two returned values used.
         2563  +    **
         2564  +    ** Similarly, iUpper is to be set to the estimate of the number of rows
         2565  +    ** less than the upper bound of the range query. Where the upper bound
         2566  +    ** is either ($P) or ($P:$U). Again, even if $U is available, both values
         2567  +    ** of iUpper are requested of whereKeyStats() and the smaller used.
         2568  +    */
         2569  +    tRowcnt iLower;
         2570  +    tRowcnt iUpper;
         2571  +
         2572  +    /* Determine iLower and iUpper using ($P) only. */
         2573  +    if( nEq==0 ){
         2574  +      iLower = 0;
         2575  +      iUpper = p->aiRowEst[0];
         2576  +    }else{
         2577  +      /* Note: this call could be optimized away - since the same values must 
         2578  +      ** have been requested when testing key $P in whereEqualScanEst().  */
         2579  +      whereKeyStats(pParse, p, pRec, 0, a);
         2580  +      iLower = a[0];
         2581  +      iUpper = a[0] + a[1];
         2582  +    }
         2583  +
         2584  +    /* If possible, improve on the iLower estimate using ($P:$L). */
  2650   2585       if( pLower ){
         2586  +      int bOk;                    /* True if value is extracted from pExpr */
  2651   2587         Expr *pExpr = pLower->pExpr->pRight;
  2652         -      rc = valueFromExpr(pParse, pExpr, aff, &pRangeVal);
  2653   2588         assert( (pLower->eOperator & (WO_GT|WO_GE))!=0 );
  2654         -      if( rc==SQLITE_OK
  2655         -       && whereKeyStats(pParse, p, pRangeVal, 0, a)==SQLITE_OK
  2656         -      ){
  2657         -        iLower = a[0];
  2658         -        if( (pLower->eOperator & WO_GT)!=0 ) iLower += a[1];
         2589  +      rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, aff, nEq, &bOk);
         2590  +      if( rc==SQLITE_OK && bOk ){
         2591  +        tRowcnt iNew;
         2592  +        whereKeyStats(pParse, p, pRec, 0, a);
         2593  +        iNew = a[0] + ((pLower->eOperator & WO_GT) ? a[1] : 0);
         2594  +        if( iNew>iLower ) iLower = iNew;
  2659   2595         }
  2660         -      sqlite3ValueFree(pRangeVal);
  2661   2596       }
  2662         -    if( rc==SQLITE_OK && pUpper ){
         2597  +
         2598  +    /* If possible, improve on the iUpper estimate using ($P:$U). */
         2599  +    if( pUpper ){
         2600  +      int bOk;                    /* True if value is extracted from pExpr */
  2663   2601         Expr *pExpr = pUpper->pExpr->pRight;
  2664         -      rc = valueFromExpr(pParse, pExpr, aff, &pRangeVal);
  2665   2602         assert( (pUpper->eOperator & (WO_LT|WO_LE))!=0 );
  2666         -      if( rc==SQLITE_OK
  2667         -       && whereKeyStats(pParse, p, pRangeVal, 1, a)==SQLITE_OK
  2668         -      ){
  2669         -        iUpper = a[0];
  2670         -        if( (pUpper->eOperator & WO_LE)!=0 ) iUpper += a[1];
         2603  +      rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, aff, nEq, &bOk);
         2604  +      if( rc==SQLITE_OK && bOk ){
         2605  +        tRowcnt iNew;
         2606  +        whereKeyStats(pParse, p, pRec, 1, a);
         2607  +        iNew = a[0] + ((pUpper->eOperator & WO_LE) ? a[1] : 0);
         2608  +        if( iNew<iUpper ) iUpper = iNew;
  2671   2609         }
  2672         -      sqlite3ValueFree(pRangeVal);
  2673   2610       }
         2611  +
         2612  +    pBuilder->pRec = pRec;
  2674   2613       if( rc==SQLITE_OK ){
  2675         -      WhereCost iBase = whereCost(p->aiRowEst[0]);
         2614  +      WhereCost nNew;
  2676   2615         if( iUpper>iLower ){
  2677         -        iBase -= whereCost(iUpper - iLower);
         2616  +        nNew = whereCost(iUpper - iLower);
         2617  +      }else{
         2618  +        nNew = 10;        assert( 10==whereCost(2) );
  2678   2619         }
  2679         -      *pRangeDiv = iBase;
  2680         -      WHERETRACE(0x100, ("range scan regions: %u..%u  div=%d\n",
  2681         -                         (u32)iLower, (u32)iUpper, *pRangeDiv));
         2620  +      if( nNew<nOut ){
         2621  +        nOut = nNew;
         2622  +      }
         2623  +      *pnOut = (WhereCost)nOut;
         2624  +      WHERETRACE(0x100, ("range scan regions: %u..%u  est=%d\n",
         2625  +                         (u32)iLower, (u32)iUpper, nOut));
  2682   2626         return SQLITE_OK;
  2683   2627       }
  2684   2628     }
  2685   2629   #else
  2686   2630     UNUSED_PARAMETER(pParse);
  2687         -  UNUSED_PARAMETER(p);
  2688         -  UNUSED_PARAMETER(nEq);
         2631  +  UNUSED_PARAMETER(pBuilder);
  2689   2632   #endif
  2690   2633     assert( pLower || pUpper );
  2691         -  *pRangeDiv = 0;
  2692   2634     /* TUNING:  Each inequality constraint reduces the search space 4-fold.
  2693   2635     ** A BETWEEN operator, therefore, reduces the search space 16-fold */
  2694   2636     if( pLower && (pLower->wtFlags & TERM_VNULL)==0 ){
  2695         -    *pRangeDiv += 20;  assert( 20==whereCost(4) );
         2637  +    nOut -= 20;        assert( 20==whereCost(4) );
  2696   2638     }
  2697   2639     if( pUpper ){
  2698         -    *pRangeDiv += 20;  assert( 20==whereCost(4) );
         2640  +    nOut -= 20;        assert( 20==whereCost(4) );
  2699   2641     }
         2642  +  if( nOut<10 ) nOut = 10;
         2643  +  *pnOut = (WhereCost)nOut;
  2700   2644     return rc;
  2701   2645   }
  2702   2646   
  2703         -#ifdef SQLITE_ENABLE_STAT3
         2647  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
  2704   2648   /*
  2705   2649   ** Estimate the number of rows that will be returned based on
  2706   2650   ** an equality constraint x=VALUE and where that VALUE occurs in
  2707   2651   ** the histogram data.  This only works when x is the left-most
  2708   2652   ** column of an index and sqlite_stat3 histogram data is available
  2709   2653   ** for that index.  When pExpr==NULL that means the constraint is
  2710   2654   ** "x IS NULL" instead of "x=VALUE".
................................................................................
  2716   2660   ** This routine can fail if it is unable to load a collating sequence
  2717   2661   ** required for string comparison, or if unable to allocate memory
  2718   2662   ** for a UTF conversion required for comparison.  The error is stored
  2719   2663   ** in the pParse structure.
  2720   2664   */
  2721   2665   static int whereEqualScanEst(
  2722   2666     Parse *pParse,       /* Parsing & code generating context */
  2723         -  Index *p,            /* The index whose left-most column is pTerm */
         2667  +  WhereLoopBuilder *pBuilder,
  2724   2668     Expr *pExpr,         /* Expression for VALUE in the x=VALUE constraint */
  2725   2669     tRowcnt *pnRow       /* Write the revised row estimate here */
  2726   2670   ){
  2727         -  sqlite3_value *pRhs = 0;  /* VALUE on right-hand side of pTerm */
         2671  +  Index *p = pBuilder->pNew->u.btree.pIndex;
         2672  +  int nEq = pBuilder->pNew->u.btree.nEq;
         2673  +  UnpackedRecord *pRec = pBuilder->pRec;
  2728   2674     u8 aff;                   /* Column affinity */
  2729   2675     int rc;                   /* Subfunction return code */
  2730   2676     tRowcnt a[2];             /* Statistics */
  2731         -
  2732         -  assert( p->aSample!=0 );
  2733         -  assert( p->nSample>0 );
  2734         -  aff = p->pTable->aCol[p->aiColumn[0]].affinity;
  2735         -  if( pExpr ){
  2736         -    rc = valueFromExpr(pParse, pExpr, aff, &pRhs);
  2737         -    if( rc ) goto whereEqualScanEst_cancel;
  2738         -  }else{
  2739         -    pRhs = sqlite3ValueNew(pParse->db);
  2740         -  }
  2741         -  if( pRhs==0 ) return SQLITE_NOTFOUND;
  2742         -  rc = whereKeyStats(pParse, p, pRhs, 0, a);
  2743         -  if( rc==SQLITE_OK ){
  2744         -    WHERETRACE(0x100,("equality scan regions: %d\n", (int)a[1]));
  2745         -    *pnRow = a[1];
  2746         -  }
  2747         -whereEqualScanEst_cancel:
  2748         -  sqlite3ValueFree(pRhs);
  2749         -  return rc;
  2750         -}
  2751         -#endif /* defined(SQLITE_ENABLE_STAT3) */
  2752         -
  2753         -#ifdef SQLITE_ENABLE_STAT3
         2677  +  int bOk;
         2678  +
         2679  +  assert( nEq>=1 );
         2680  +  assert( nEq<=(p->nColumn+1) );
         2681  +  assert( p->aSample!=0 );
         2682  +  assert( p->nSample>0 );
         2683  +  assert( pBuilder->nRecValid<nEq );
         2684  +
         2685  +  /* If values are not available for all fields of the index to the left
         2686  +  ** of this one, no estimate can be made. Return SQLITE_NOTFOUND. */
         2687  +  if( pBuilder->nRecValid<(nEq-1) ){
         2688  +    return SQLITE_NOTFOUND;
         2689  +  }
         2690  +
         2691  +  /* This is an optimization only. The call to sqlite3Stat4ProbeSetValue()
         2692  +  ** below would return the same value.  */
         2693  +  if( nEq>p->nColumn ){
         2694  +    *pnRow = 1;
         2695  +    return SQLITE_OK;
         2696  +  }
         2697  +
         2698  +  aff = p->pTable->aCol[p->aiColumn[nEq-1]].affinity;
         2699  +  rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, aff, nEq-1, &bOk);
         2700  +  pBuilder->pRec = pRec;
         2701  +  if( rc!=SQLITE_OK ) return rc;
         2702  +  if( bOk==0 ) return SQLITE_NOTFOUND;
         2703  +  pBuilder->nRecValid = nEq;
         2704  +
         2705  +  whereKeyStats(pParse, p, pRec, 0, a);
         2706  +  WHERETRACE(0x100,("equality scan regions: %d\n", (int)a[1]));
         2707  +  *pnRow = a[1];
         2708  +  
         2709  +  return rc;
         2710  +}
         2711  +#endif /* defined(SQLITE_ENABLE_STAT4) */
         2712  +
         2713  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
  2754   2714   /*
  2755   2715   ** Estimate the number of rows that will be returned based on
  2756   2716   ** an IN constraint where the right-hand side of the IN operator
  2757   2717   ** is a list of values.  Example:
  2758   2718   **
  2759   2719   **        WHERE x IN (1,2,3,4)
  2760   2720   **
................................................................................
  2765   2725   ** This routine can fail if it is unable to load a collating sequence
  2766   2726   ** required for string comparison, or if unable to allocate memory
  2767   2727   ** for a UTF conversion required for comparison.  The error is stored
  2768   2728   ** in the pParse structure.
  2769   2729   */
  2770   2730   static int whereInScanEst(
  2771   2731     Parse *pParse,       /* Parsing & code generating context */
  2772         -  Index *p,            /* The index whose left-most column is pTerm */
         2732  +  WhereLoopBuilder *pBuilder,
  2773   2733     ExprList *pList,     /* The value list on the RHS of "x IN (v1,v2,v3,...)" */
  2774   2734     tRowcnt *pnRow       /* Write the revised row estimate here */
  2775   2735   ){
         2736  +  Index *p = pBuilder->pNew->u.btree.pIndex;
         2737  +  int nRecValid = pBuilder->nRecValid;
  2776   2738     int rc = SQLITE_OK;     /* Subfunction return code */
  2777   2739     tRowcnt nEst;           /* Number of rows for a single term */
  2778   2740     tRowcnt nRowEst = 0;    /* New estimate of the number of rows */
  2779   2741     int i;                  /* Loop counter */
  2780   2742   
  2781   2743     assert( p->aSample!=0 );
  2782   2744     for(i=0; rc==SQLITE_OK && i<pList->nExpr; i++){
  2783   2745       nEst = p->aiRowEst[0];
  2784         -    rc = whereEqualScanEst(pParse, p, pList->a[i].pExpr, &nEst);
         2746  +    rc = whereEqualScanEst(pParse, pBuilder, pList->a[i].pExpr, &nEst);
  2785   2747       nRowEst += nEst;
         2748  +    pBuilder->nRecValid = nRecValid;
  2786   2749     }
         2750  +
  2787   2751     if( rc==SQLITE_OK ){
  2788   2752       if( nRowEst > p->aiRowEst[0] ) nRowEst = p->aiRowEst[0];
  2789   2753       *pnRow = nRowEst;
  2790   2754       WHERETRACE(0x100,("IN row estimate: est=%g\n", nRowEst));
  2791   2755     }
         2756  +  assert( pBuilder->nRecValid==nRecValid );
  2792   2757     return rc;
  2793   2758   }
  2794         -#endif /* defined(SQLITE_ENABLE_STAT3) */
         2759  +#endif /* defined(SQLITE_ENABLE_STAT4) */
  2795   2760   
  2796   2761   /*
  2797   2762   ** Disable a term in the WHERE clause.  Except, do not disable the term
  2798   2763   ** if it controls a LEFT OUTER JOIN and it did not originate in the ON
  2799   2764   ** or USING clause of that join.
  2800   2765   **
  2801   2766   ** Consider the term t2.z='ok' in the following queries:
................................................................................
  4331   4296     saved_wsFlags = pNew->wsFlags;
  4332   4297     saved_prereq = pNew->prereq;
  4333   4298     saved_nOut = pNew->nOut;
  4334   4299     pNew->rSetup = 0;
  4335   4300     rLogSize = estLog(whereCost(pProbe->aiRowEst[0]));
  4336   4301     for(; rc==SQLITE_OK && pTerm!=0; pTerm = whereScanNext(&scan)){
  4337   4302       int nIn = 0;
  4338         -    if( pTerm->prereqRight & pNew->maskSelf ) continue;
  4339         -#ifdef SQLITE_ENABLE_STAT3
         4303  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         4304  +    int nRecValid = pBuilder->nRecValid;
         4305  +    assert( pNew->nOut==saved_nOut );
  4340   4306       if( (pTerm->wtFlags & TERM_VNULL)!=0 && pSrc->pTab->aCol[iCol].notNull ){
  4341   4307         continue; /* skip IS NOT NULL constraints on a NOT NULL column */
  4342   4308       }
  4343   4309   #endif
         4310  +    if( pTerm->prereqRight & pNew->maskSelf ) continue;
         4311  +
         4312  +    assert( pNew->nOut==saved_nOut );
         4313  +
  4344   4314       pNew->wsFlags = saved_wsFlags;
  4345   4315       pNew->u.btree.nEq = saved_nEq;
  4346   4316       pNew->nLTerm = saved_nLTerm;
  4347   4317       if( whereLoopResize(db, pNew, pNew->nLTerm+1) ) break; /* OOM */
  4348   4318       pNew->aLTerm[pNew->nLTerm++] = pTerm;
  4349   4319       pNew->prereq = (saved_prereq | pTerm->prereqRight) & ~pNew->maskSelf;
  4350   4320       pNew->rRun = rLogSize; /* Baseline cost is log2(N).  Adjustments below */
................................................................................
  4393   4363         pNew->wsFlags |= WHERE_COLUMN_RANGE|WHERE_TOP_LIMIT;
  4394   4364         pTop = pTerm;
  4395   4365         pBtm = (pNew->wsFlags & WHERE_BTM_LIMIT)!=0 ?
  4396   4366                        pNew->aLTerm[pNew->nLTerm-2] : 0;
  4397   4367       }
  4398   4368       if( pNew->wsFlags & WHERE_COLUMN_RANGE ){
  4399   4369         /* Adjust nOut and rRun for STAT3 range values */
  4400         -      WhereCost rDiv;
  4401         -      whereRangeScanEst(pParse, pProbe, pNew->u.btree.nEq,
  4402         -                        pBtm, pTop, &rDiv);
  4403         -      pNew->nOut = saved_nOut>rDiv+10 ? saved_nOut - rDiv : 10;
         4370  +      assert( pNew->nOut==saved_nOut );
         4371  +      whereRangeScanEst(pParse, pBuilder, pBtm, pTop, &pNew->nOut);
  4404   4372       }
  4405         -#ifdef SQLITE_ENABLE_STAT3
  4406         -    if( pNew->u.btree.nEq==1 && pProbe->nSample
  4407         -     &&  OptimizationEnabled(db, SQLITE_Stat3) ){
         4373  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         4374  +    if( nInMul==0 
         4375  +     && pProbe->nSample 
         4376  +     && pNew->u.btree.nEq<=pProbe->nSampleCol
         4377  +     && OptimizationEnabled(db, SQLITE_Stat3) 
         4378  +    ){
         4379  +      Expr *pExpr = pTerm->pExpr;
  4408   4380         tRowcnt nOut = 0;
  4409   4381         if( (pTerm->eOperator & (WO_EQ|WO_ISNULL))!=0 ){
  4410   4382           testcase( pTerm->eOperator & WO_EQ );
  4411   4383           testcase( pTerm->eOperator & WO_ISNULL );
  4412         -        rc = whereEqualScanEst(pParse, pProbe, pTerm->pExpr->pRight, &nOut);
         4384  +        rc = whereEqualScanEst(pParse, pBuilder, pExpr->pRight, &nOut);
  4413   4385         }else if( (pTerm->eOperator & WO_IN)
  4414         -             &&  !ExprHasProperty(pTerm->pExpr, EP_xIsSelect)  ){
  4415         -        rc = whereInScanEst(pParse, pProbe, pTerm->pExpr->x.pList, &nOut);
         4386  +             &&  !ExprHasProperty(pExpr, EP_xIsSelect)  ){
         4387  +        rc = whereInScanEst(pParse, pBuilder, pExpr->x.pList, &nOut);
  4416   4388         }
  4417   4389         assert( nOut==0 || rc==SQLITE_OK );
  4418         -      if( nOut ) pNew->nOut = whereCost(nOut);
         4390  +      if( nOut ){
         4391  +        nOut = whereCost(nOut);
         4392  +        pNew->nOut = MIN(nOut, saved_nOut);
         4393  +      }
  4419   4394       }
  4420   4395   #endif
  4421   4396       if( (pNew->wsFlags & (WHERE_IDX_ONLY|WHERE_IPK))==0 ){
  4422   4397         /* Each row involves a step of the index, then a binary search of
  4423   4398         ** the main table */
  4424   4399         pNew->rRun =  whereCostAdd(pNew->rRun, rLogSize>27 ? rLogSize-17 : 10);
  4425   4400       }
................................................................................
  4428   4403       /* TBD: Adjust nOut for additional constraints */
  4429   4404       rc = whereLoopInsert(pBuilder, pNew);
  4430   4405       if( (pNew->wsFlags & WHERE_TOP_LIMIT)==0
  4431   4406        && pNew->u.btree.nEq<(pProbe->nColumn + (pProbe->zName!=0))
  4432   4407       ){
  4433   4408         whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, nInMul+nIn);
  4434   4409       }
         4410  +    pNew->nOut = saved_nOut;
         4411  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         4412  +    pBuilder->nRecValid = nRecValid;
         4413  +#endif
  4435   4414     }
  4436   4415     pNew->prereq = saved_prereq;
  4437   4416     pNew->u.btree.nEq = saved_nEq;
  4438   4417     pNew->wsFlags = saved_wsFlags;
  4439   4418     pNew->nOut = saved_nOut;
  4440   4419     pNew->nLTerm = saved_nLTerm;
  4441   4420     return rc;
................................................................................
  4654   4633             ** which we will simplify to just N*log2(N) */
  4655   4634             pNew->rRun = rSize + rLogSize;
  4656   4635           }
  4657   4636           rc = whereLoopInsert(pBuilder, pNew);
  4658   4637           if( rc ) break;
  4659   4638         }
  4660   4639       }
         4640  +
  4661   4641       rc = whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, 0);
         4642  +#if defined(SQLITE_ENABLE_STAT4) || defined(SQLITE_ENABLE_STAT3)
         4643  +    sqlite3Stat4ProbeFree(pBuilder->pRec);
         4644  +    pBuilder->nRecValid = 0;
         4645  +    pBuilder->pRec = 0;
         4646  +#endif
  4662   4647   
  4663   4648       /* If there was an INDEXED BY clause, then only that one index is
  4664   4649       ** considered. */
  4665   4650       if( pSrc->pIndex ) break;
  4666   4651     }
  4667   4652     return rc;
  4668   4653   }

Changes to test/alter.test.

   843    843   
   844    844   #-------------------------------------------------------------------------
   845    845   # Test that it is not possible to use ALTER TABLE on any system table.
   846    846   #
   847    847   set system_table_list {1 sqlite_master}
   848    848   catchsql ANALYZE
   849    849   ifcapable analyze { lappend system_table_list 2 sqlite_stat1 }
   850         -ifcapable stat3   { lappend system_table_list 4 sqlite_stat3 }
          850  +ifcapable stat4   { lappend system_table_list 4 sqlite_stat4 }
   851    851   
   852    852   foreach {tn tbl} $system_table_list {
   853    853     do_test alter-15.$tn.1 {
   854    854       catchsql "ALTER TABLE $tbl RENAME TO xyz"
   855    855     } [list 1 "table $tbl may not be altered"]
   856    856   
   857    857     do_test alter-15.$tn.2 {
   858    858       catchsql "ALTER TABLE $tbl ADD COLUMN xyz"
   859    859     } [list 1 "table $tbl may not be altered"]
   860    860   }
   861    861   
   862    862   
   863    863   finish_test

Changes to test/alter4.test.

   137    137         alter table v1 add column d;
   138    138       }
   139    139     } {1 {Cannot add a column to a view}}
   140    140   }
   141    141   do_test alter4-2.6 {
   142    142     catchsql {
   143    143       alter table t1 add column d DEFAULT CURRENT_TIME;
          144  +  }
          145  +} {1 {Cannot add a column with non-constant default}}
          146  +do_test alter4-2.7 {
          147  +  catchsql {
          148  +    alter table t1 add column d default (-+1);
   144    149     }
   145    150   } {1 {Cannot add a column with non-constant default}}
   146    151   do_test alter4-2.99 {
   147    152     execsql {
   148    153       DROP TABLE t1;
   149    154     }
   150    155   } {}

Changes to test/analyze.test.

   284    284     sqlite3 db test.db
   285    285     execsql {
   286    286       SELECT * FROM t4 WHERE x=1234;
   287    287     }
   288    288   } {}
   289    289   
   290    290   # Verify that DROP TABLE and DROP INDEX remove entries from the 
   291         -# sqlite_stat1 and sqlite_stat3 tables.
          291  +# sqlite_stat1, sqlite_stat3 and sqlite_stat4 tables.
   292    292   #
   293    293   do_test analyze-5.0 {
   294    294     execsql {
   295    295       DELETE FROM t3;
   296    296       DELETE FROM t4;
   297    297       INSERT INTO t3 VALUES(1,2,3,4);
   298    298       INSERT INTO t3 VALUES(5,6,7,8);
................................................................................
   302    302       INSERT INTO t3 SELECT a+64, b+64, c+64, d+64 FROM t3;
   303    303       INSERT INTO t4 SELECT a, b, c FROM t3;
   304    304       ANALYZE;
   305    305       SELECT DISTINCT idx FROM sqlite_stat1 ORDER BY 1;
   306    306       SELECT DISTINCT tbl FROM sqlite_stat1 ORDER BY 1;
   307    307     }
   308    308   } {t3i1 t3i2 t3i3 t4i1 t4i2 t3 t4}
   309         -ifcapable stat3 {
          309  +ifcapable stat4||stat3 {
          310  +  ifcapable stat4 {set stat sqlite_stat4} else {set stat sqlite_stat3}
   310    311     do_test analyze-5.1 {
   311         -    execsql {
   312         -      SELECT DISTINCT idx FROM sqlite_stat3 ORDER BY 1;
   313         -      SELECT DISTINCT tbl FROM sqlite_stat3 ORDER BY 1;
   314         -    }
          312  +    execsql "
          313  +      SELECT DISTINCT idx FROM $stat ORDER BY 1;
          314  +      SELECT DISTINCT tbl FROM $stat ORDER BY 1;
          315  +    "
   315    316     } {t3i1 t3i2 t3i3 t4i1 t4i2 t3 t4}
   316    317   }
   317    318   do_test analyze-5.2 {
   318    319     execsql {
   319    320       DROP INDEX t3i2;
   320    321       SELECT DISTINCT idx FROM sqlite_stat1 ORDER BY 1;
   321    322       SELECT DISTINCT tbl FROM sqlite_stat1 ORDER BY 1;
   322    323     }
   323    324   } {t3i1 t3i3 t4i1 t4i2 t3 t4}
   324         -ifcapable stat3 {
          325  +ifcapable stat4||stat3 {
   325    326     do_test analyze-5.3 {
   326         -    execsql {
   327         -      SELECT DISTINCT idx FROM sqlite_stat3 ORDER BY 1;
   328         -      SELECT DISTINCT tbl FROM sqlite_stat3 ORDER BY 1;
   329         -    }
          327  +    execsql "
          328  +      SELECT DISTINCT idx FROM $stat ORDER BY 1;
          329  +      SELECT DISTINCT tbl FROM $stat ORDER BY 1;
          330  +    "
   330    331     } {t3i1 t3i3 t4i1 t4i2 t3 t4}
   331    332   }
   332    333   do_test analyze-5.4 {
   333    334     execsql {
   334    335       DROP TABLE t3;
   335    336       SELECT DISTINCT idx FROM sqlite_stat1 ORDER BY 1;
   336    337       SELECT DISTINCT tbl FROM sqlite_stat1 ORDER BY 1;
   337    338     }
   338    339   } {t4i1 t4i2 t4}
   339         -ifcapable stat3 {
          340  +ifcapable stat4||stat3 {
   340    341     do_test analyze-5.5 {
   341         -    execsql {
   342         -      SELECT DISTINCT idx FROM sqlite_stat3 ORDER BY 1;
   343         -      SELECT DISTINCT tbl FROM sqlite_stat3 ORDER BY 1;
   344         -    }
          342  +    execsql "
          343  +      SELECT DISTINCT idx FROM $stat ORDER BY 1;
          344  +      SELECT DISTINCT tbl FROM $stat ORDER BY 1;
          345  +    "
   345    346     } {t4i1 t4i2 t4}
   346    347   }
   347    348   
   348    349   # This test corrupts the database file so it must be the last test
   349    350   # in the series.
   350    351   #
   351    352   do_test analyze-99.1 {
................................................................................
   355    356     }
   356    357     db close
   357    358     catch { sqlite3 db test.db }
   358    359     catchsql {
   359    360       ANALYZE
   360    361     }
   361    362   } {1 {malformed database schema (sqlite_stat1) - near "nonsense": syntax error}}
   362         -
   363    363   
   364    364   finish_test

Changes to test/analyze3.test.

    13     13   # implements tests for range and LIKE constraints that use bound variables
    14     14   # instead of literal constant arguments.
    15     15   #
    16     16   
    17     17   set testdir [file dirname $argv0]
    18     18   source $testdir/tester.tcl
    19     19   
    20         -ifcapable !stat3 {
           20  +ifcapable !stat4&&!stat3 {
    21     21     finish_test
    22     22     return
    23     23   }
    24     24   
    25     25   #----------------------------------------------------------------------
    26     26   # Test Organization:
    27     27   #
................................................................................
    91     91     for {set i 0} {$i < 1000} {incr i} {
    92     92       execsql { INSERT INTO t1 VALUES($i+100, $i) }
    93     93     }
    94     94     execsql {
    95     95       COMMIT;
    96     96       ANALYZE;
    97     97     }
    98         -} {}
           98  +
           99  +  ifcapable stat4 {
          100  +    execsql { SELECT count(*)>0 FROM sqlite_stat4; }
          101  +  } else {
          102  +    execsql { SELECT count(*)>0 FROM sqlite_stat3; }
          103  +  }
          104  +} {1}
    99    105   
   100    106   do_eqp_test analyze3-1.1.2 {
   101    107     SELECT sum(y) FROM t1 WHERE x>200 AND x<300
   102    108   } {0 0 0 {SEARCH TABLE t1 USING INDEX i1 (x>? AND x<?)}}
   103    109   do_eqp_test analyze3-1.1.3 {
   104    110     SELECT sum(y) FROM t1 WHERE x>0 AND x<1100 
   105    111   } {0 0 0 {SEARCH TABLE t1 USING INDEX i1 (x>? AND x<?)}}
................................................................................
   308    314     }
   309    315     for {set i 0} {$i < 100} {incr i} {
   310    316       execsql { INSERT INTO t1 VALUES($i, $i, $i) }
   311    317     }
   312    318     execsql COMMIT
   313    319     execsql ANALYZE
   314    320   } {}
   315         -
   316    321   do_test analyze3-3.2.1 {
   317    322     set S [sqlite3_prepare_v2 db "SELECT * FROM t1 WHERE b>?" -1 dummy]
   318    323     sqlite3_expired $S
   319    324   } {0}
   320    325   do_test analyze3-3.2.2 {
   321    326     sqlite3_bind_text $S 1 "abc" 3
   322    327     sqlite3_expired $S

Changes to test/analyze5.test.

     6      6   #    May you do good and not evil.
     7      7   #    May you find forgiveness for yourself and forgive others.
     8      8   #    May you share freely, never taking more than you give.
     9      9   #
    10     10   #***********************************************************************
    11     11   #
    12     12   # This file implements tests for SQLite library.  The focus of the tests
    13         -# in this file is the use of the sqlite_stat3 histogram data on tables
           13  +# in this file is the use of the sqlite_stat4 histogram data on tables
    14     14   # with many repeated values and only a few distinct values.
    15     15   #
    16     16   
    17     17   set testdir [file dirname $argv0]
    18     18   source $testdir/tester.tcl
    19     19   
    20         -ifcapable !stat3 {
           20  +ifcapable !stat4&&!stat3 {
    21     21     finish_test
    22     22     return
    23     23   }
    24     24   
    25     25   set testprefix analyze5
    26     26   
    27     27   proc eqp {sql {db db}} {
    28     28     uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
    29     29   }
    30     30   
           31  +proc alpha {blob} {
           32  +  set ret ""
           33  +  foreach c [split $blob {}] {
           34  +    if {[string is alpha $c]} {append ret $c}
           35  +  }
           36  +  return $ret
           37  +}
           38  +db func alpha alpha
           39  +
           40  +db func lindex lindex
           41  +
    31     42   unset -nocomplain i t u v w x y z
    32     43   do_test analyze5-1.0 {
    33     44     db eval {CREATE TABLE t1(t,u,v TEXT COLLATE nocase,w,x,y,z)}
    34     45     for {set i 0} {$i < 1000} {incr i} {
    35     46       set y [expr {$i>=25 && $i<=50}]
    36     47       set z [expr {($i>=400) + ($i>=700) + ($i>=875)}]
    37     48       set x $z
................................................................................
    51     62       CREATE INDEX t1u ON t1(u);  -- text
    52     63       CREATE INDEX t1v ON t1(v);  -- mixed case text
    53     64       CREATE INDEX t1w ON t1(w);  -- integers 0, 1, 2 and a few NULLs
    54     65       CREATE INDEX t1x ON t1(x);  -- integers 1, 2, 3 and many NULLs
    55     66       CREATE INDEX t1y ON t1(y);  -- integers 0 and very few 1s
    56     67       CREATE INDEX t1z ON t1(z);  -- integers 0, 1, 2, and 3
    57     68       ANALYZE;
    58         -    SELECT sample FROM sqlite_stat3 WHERE idx='t1u' ORDER BY nlt;
           69  +  }
           70  +  ifcapable stat4 {
           71  +    db eval {
           72  +      SELECT DISTINCT lindex(test_decode(sample),0) 
           73  +        FROM sqlite_stat4 WHERE idx='t1u' ORDER BY nlt;
           74  +    }
           75  +  } else {
           76  +    db eval {
           77  +      SELECT sample FROM sqlite_stat3 WHERE idx='t1u' ORDER BY nlt;
           78  +    }
    59     79     }
    60     80   } {alpha bravo charlie delta}
    61     81   
    62     82   do_test analyze5-1.1 {
    63         -  db eval {SELECT DISTINCT lower(sample) FROM sqlite_stat3 WHERE idx='t1v'
    64         -             ORDER BY 1}
           83  +  ifcapable stat4 {
           84  +    db eval {
           85  +      SELECT DISTINCT lower(lindex(test_decode(sample), 0)) 
           86  +        FROM sqlite_stat4 WHERE idx='t1v' ORDER BY 1
           87  +    }
           88  +  } else {
           89  +    db eval {
           90  +      SELECT lower(sample) FROM sqlite_stat3 WHERE idx='t1v' ORDER BY 1
           91  +    }
           92  +  }
    65     93   } {alpha bravo charlie delta}
    66         -do_test analyze5-1.2 {
    67         -  db eval {SELECT idx, count(*) FROM sqlite_stat3 GROUP BY 1 ORDER BY 1}
    68         -} {t1t 4 t1u 4 t1v 4 t1w 4 t1x 4 t1y 2 t1z 4}
           94  +ifcapable stat4 {
           95  +  do_test analyze5-1.2 {
           96  +    db eval {SELECT idx, count(*) FROM sqlite_stat4 GROUP BY 1 ORDER BY 1}
           97  +  } {t1t 8 t1u 8 t1v 8 t1w 8 t1x 8 t1y 9 t1z 8}
           98  +} else {
           99  +  do_test analyze5-1.2 {
          100  +    db eval {SELECT idx, count(*) FROM sqlite_stat3 GROUP BY 1 ORDER BY 1}
          101  +  } {t1t 4 t1u 4 t1v 4 t1w 4 t1x 4 t1y 2 t1z 4}
          102  +}
    69    103   
    70    104   # Verify that range queries generate the correct row count estimates
    71    105   #
    72    106   foreach {testid where index rows} {
    73    107       1  {z>=0 AND z<=0}       t1z  400
    74    108       2  {z>=1 AND z<=1}       t1z  300
    75    109       3  {z>=2 AND z<=2}       t1z  175

Changes to test/analyze6.test.

    13     13   # in this file a corner-case query planner optimization involving the
    14     14   # join order of two tables of different sizes.
    15     15   #
    16     16   
    17     17   set testdir [file dirname $argv0]
    18     18   source $testdir/tester.tcl
    19     19   
    20         -ifcapable !stat3 {
           20  +ifcapable !stat4&&!stat3 {
    21     21     finish_test
    22     22     return
    23     23   }
    24     24   
    25     25   set testprefix analyze6
    26     26   
    27     27   proc eqp {sql {db db}} {

Changes to test/analyze7.test.

    78     78   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}}
    79     79   do_test analyze7-3.1 {
    80     80     execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
    81     81   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?)}}
    82     82   do_test analyze7-3.2.1 {
    83     83     execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=?;}
    84     84   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?)}}
    85         -ifcapable stat3 {
    86         -  # If ENABLE_STAT3 is defined, SQLite comes up with a different estimated
           85  +ifcapable stat4||stat3 {
           86  +  # If ENABLE_STAT4 is defined, SQLite comes up with a different estimated
    87     87     # row count for (c=2) than it does for (c=?).
    88     88     do_test analyze7-3.2.2 {
    89     89       execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
    90     90     } {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?)}}
    91     91   } else {
    92         -  # If ENABLE_STAT3 is not defined, the expected row count for (c=2) is the
           92  +  # If ENABLE_STAT4 is not defined, the expected row count for (c=2) is the
    93     93     # same as that for (c=?).
    94     94     do_test analyze7-3.2.3 {
    95     95       execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
    96     96     } {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?)}}
    97     97   }
    98     98   do_test analyze7-3.3 {
    99     99     execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND b=123}
   100    100   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}}
   101         -ifcapable {!stat3} {
          101  +
          102  +ifcapable {!stat4 && !stat3} {
   102    103     do_test analyze7-3.4 {
   103    104       execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=123 AND b=123}
   104    105     } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?)}}
   105    106     do_test analyze7-3.5 {
   106    107       execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND c=123}
   107    108     } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}}
   108    109   }
   109    110   do_test analyze7-3.6 {
   110    111     execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=123 AND d=123 AND b=123}
   111    112   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=? AND d=?)}}
   112    113   
   113    114   finish_test

Changes to test/analyze8.test.

    12     12   # This file implements tests for SQLite library.  The focus of the tests
    13     13   # in this file is testing the capabilities of sqlite_stat3.
    14     14   #
    15     15   
    16     16   set testdir [file dirname $argv0]
    17     17   source $testdir/tester.tcl
    18     18   
    19         -ifcapable !stat3 {
           19  +ifcapable !stat4&&!stat3 {
    20     20     finish_test
    21     21     return
    22     22   }
    23     23   
    24     24   set testprefix analyze8
    25     25   
    26     26   proc eqp {sql {db db}} {
................................................................................
    80     80   do_test 2.1 {
    81     81     eqp {SELECT * FROM t1 WHERE a=100 AND b BETWEEN 50 AND 54}
    82     82   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b>? AND b<?)}}
    83     83   
    84     84   # There are many more values of c between 0 and 100000 than there are
    85     85   # between 800000 and 900000.  So t1c is more selective for the latter
    86     86   # range.
           87  +# 
           88  +# Test 3.2 is a little unstable. It depends on the planner estimating
           89  +# that (b BETWEEN 50 AND 54) will match more rows than (c BETWEEN
           90  +# 800000 AND 900000). Which is a pretty close call (50 vs. 32), so
           91  +# the planner could get it wrong with an unlucky set of samples. This
           92  +# case happens to work, but others ("b BETWEEN 40 AND 44" for example) 
           93  +# will fail.
    87     94   #
           95  +do_execsql_test 3.0 {
           96  +  SELECT count(*) FROM t1 WHERE b BETWEEN 50 AND 54;
           97  +  SELECT count(*) FROM t1 WHERE c BETWEEN 0 AND 100000;
           98  +  SELECT count(*) FROM t1 WHERE c BETWEEN 800000 AND 900000;
           99  +} {50 376 32}
    88    100   do_test 3.1 {
    89    101     eqp {SELECT * FROM t1 WHERE b BETWEEN 50 AND 54 AND c BETWEEN 0 AND 100000}
    90    102   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b>? AND b<?)}}
    91    103   do_test 3.2 {
    92    104     eqp {SELECT * FROM t1
    93    105          WHERE b BETWEEN 50 AND 54 AND c BETWEEN 800000 AND 900000}
    94    106   } {0 0 0 {SEARCH TABLE t1 USING INDEX t1c (c>? AND c<?)}}

Added test/analyze9.test.

            1  +# 2013 August 3
            2  +#
            3  +# The author disclaims copyright to this source code.  In place of
            4  +# a legal notice, here is a blessing:
            5  +#
            6  +#    May you do good and not evil.
            7  +#    May you find forgiveness for yourself and forgive others.
            8  +#    May you share freely, never taking more than you give.
            9  +#
           10  +#***********************************************************************
           11  +#
           12  +# This file contains automated tests used to verify that the sqlite_stat4
           13  +# functionality is working.
           14  +#
           15  +
           16  +set testdir [file dirname $argv0]
           17  +source $testdir/tester.tcl
           18  +set testprefix analyze9
           19  +
           20  +ifcapable !stat4 {
           21  +  finish_test
           22  +  return
           23  +}
           24  +
           25  +proc s {blob} {
           26  +  set ret ""
           27  +  binary scan $blob c* bytes
           28  +  foreach b $bytes {
           29  +    set t [binary format c $b]
           30  +    if {[string is print $t]} {
           31  +      append ret $t
           32  +    } else {
           33  +      append ret .
           34  +    }
           35  +  }
           36  +  return $ret
           37  +}
           38  +db function s s
           39  +
           40  +do_execsql_test 1.0 {
           41  +  CREATE TABLE t1(a TEXT, b TEXT); 
           42  +  INSERT INTO t1 VALUES('(0)', '(0)');
           43  +  INSERT INTO t1 VALUES('(1)', '(1)');
           44  +  INSERT INTO t1 VALUES('(2)', '(2)');
           45  +  INSERT INTO t1 VALUES('(3)', '(3)');
           46  +  INSERT INTO t1 VALUES('(4)', '(4)');
           47  +  CREATE INDEX i1 ON t1(a, b);
           48  +} {}
           49  +
           50  +
           51  +do_execsql_test 1.1 {
           52  +  ANALYZE;
           53  +} {}
           54  +
           55  +do_execsql_test 1.2 {
           56  +  SELECT tbl,idx,nEq,nLt,nDLt,test_decode(sample) FROM sqlite_stat4;
           57  +} {
           58  +  t1 i1 {1 1 1} {0 0 0} {0 0 0} {(0) (0) 1}
           59  +  t1 i1 {1 1 1} {1 1 1} {1 1 1} {(1) (1) 2}
           60  +  t1 i1 {1 1 1} {2 2 2} {2 2 2} {(2) (2) 3}
           61  +  t1 i1 {1 1 1} {3 3 3} {3 3 3} {(3) (3) 4}
           62  +  t1 i1 {1 1 1} {4 4 4} {4 4 4} {(4) (4) 5}
           63  +}
           64  +
           65  +if {[permutation] != "utf16"} {
           66  +  do_execsql_test 1.3 {
           67  +    SELECT tbl,idx,nEq,nLt,nDLt,s(sample) FROM sqlite_stat4;
           68  +  } {
           69  +    t1 i1 {1 1 1} {0 0 0} {0 0 0} ....(0)(0)
           70  +    t1 i1 {1 1 1} {1 1 1} {1 1 1} ....(1)(1).
           71  +    t1 i1 {1 1 1} {2 2 2} {2 2 2} ....(2)(2).
           72  +    t1 i1 {1 1 1} {3 3 3} {3 3 3} ....(3)(3).
           73  +    t1 i1 {1 1 1} {4 4 4} {4 4 4} ....(4)(4).
           74  +  }
           75  +}
           76  +
           77  +
           78  +#-------------------------------------------------------------------------
           79  +# This is really just to test SQL user function "test_decode".
           80  +#
           81  +reset_db
           82  +do_execsql_test 2.1 {
           83  +  CREATE TABLE t1(a, b, c);
           84  +  INSERT INTO t1 VALUES('some text', 14, NULL);
           85  +  INSERT INTO t1 VALUES(22.0, NULL, x'656667');
           86  +  CREATE INDEX i1 ON t1(a, b, c);
           87  +  ANALYZE;
           88  +  SELECT test_decode(sample) FROM sqlite_stat4;
           89  +} {
           90  +  {22.0 NULL x'656667' 2} 
           91  +  {{some text} 14 NULL 1}
           92  +}
           93  +
           94  +#-------------------------------------------------------------------------
           95  +# 
           96  +reset_db
           97  +do_execsql_test 3.1 {
           98  +  CREATE TABLE t2(a, b);
           99  +  CREATE INDEX i2 ON t2(a, b);
          100  +  BEGIN;
          101  +}
          102  +
          103  +do_test 3.2 {
          104  +  for {set i 0} {$i < 1000} {incr i} {
          105  +    set a [expr $i / 10]
          106  +    set b [expr int(rand() * 15.0)]
          107  +    execsql { INSERT INTO t2 VALUES($a, $b) }
          108  +  }
          109  +  execsql COMMIT
          110  +} {}
          111  +
          112  +db func lindex lindex
          113  +
          114  +# Each value of "a" occurs exactly 10 times in the table.
          115  +#
          116  +do_execsql_test 3.3.1 {
          117  +  SELECT count(*) FROM t2 GROUP BY a;
          118  +} [lrange [string repeat "10 " 100] 0 99]
          119  +
          120  +# The first element in the "nEq" list of all samples should therefore be 10.
          121  +#
          122  +do_execsql_test 3.3.2 {
          123  +  ANALYZE;
          124  +  SELECT lindex(nEq, 0) FROM sqlite_stat4;
          125  +} [lrange [string repeat "10 " 100] 0 23]
          126  +
          127  +#-------------------------------------------------------------------------
          128  +# 
          129  +do_execsql_test 3.4 {
          130  +  DROP TABLE IF EXISTS t1;
          131  +  CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c);
          132  +  INSERT INTO t1 VALUES(1, 1, 'one-a');
          133  +  INSERT INTO t1 VALUES(11, 1, 'one-b');
          134  +  INSERT INTO t1 VALUES(21, 1, 'one-c');
          135  +  INSERT INTO t1 VALUES(31, 1, 'one-d');
          136  +  INSERT INTO t1 VALUES(41, 1, 'one-e');
          137  +  INSERT INTO t1 VALUES(51, 1, 'one-f');
          138  +  INSERT INTO t1 VALUES(61, 1, 'one-g');
          139  +  INSERT INTO t1 VALUES(71, 1, 'one-h');
          140  +  INSERT INTO t1 VALUES(81, 1, 'one-i');
          141  +  INSERT INTO t1 VALUES(91, 1, 'one-j');
          142  +  INSERT INTO t1 SELECT a+1,2,'two' || substr(c,4) FROM t1;
          143  +  INSERT INTO t1 SELECT a+2,3,'three'||substr(c,4) FROM t1 WHERE c GLOB 'one-*';
          144  +  INSERT INTO t1 SELECT a+3,4,'four'||substr(c,4) FROM t1 WHERE c GLOB 'one-*';
          145  +  INSERT INTO t1 SELECT a+4,5,'five'||substr(c,4) FROM t1 WHERE c GLOB 'one-*';
          146  +  INSERT INTO t1 SELECT a+5,6,'six'||substr(c,4) FROM t1 WHERE c GLOB 'one-*';	
          147  +  CREATE INDEX t1b ON t1(b);
          148  +  ANALYZE;
          149  +  SELECT c FROM t1 WHERE b=3 AND a BETWEEN 30 AND 60;
          150  +} {three-d three-e three-f}
          151  +
          152  +
          153  +#-------------------------------------------------------------------------
          154  +# These tests verify that the sample selection for stat4 appears to be 
          155  +# working as designed.
          156  +#
          157  +
          158  +reset_db
          159  +db func lindex lindex
          160  +db func lrange lrange
          161  +
          162  +do_execsql_test 4.0 {
          163  +  DROP TABLE IF EXISTS t1;
          164  +  CREATE TABLE t1(a, b, c);
          165  +  CREATE INDEX i1 ON t1(c, b, a);
          166  +}
          167  +
          168  +
          169  +proc insert_filler_rows_n {iStart args} {
          170  +  set A(-ncopy) 1
          171  +  set A(-nval) 1
          172  +
          173  +  foreach {k v} $args {
          174  +    if {[info exists A($k)]==0} { error "no such option: $k" }
          175  +    set A($k) $v
          176  +  }
          177  +  if {[llength $args] % 2} {
          178  +    error "option requires an argument: [lindex $args end]"
          179  +  }
          180  +
          181  +  for {set i 0} {$i < $A(-nval)} {incr i} {
          182  +    set iVal [expr $iStart+$i]
          183  +    for {set j 0} {$j < $A(-ncopy)} {incr j} {
          184  +      execsql { INSERT INTO t1 VALUES($iVal, $iVal, $iVal) }
          185  +    }
          186  +  }
          187  +}
          188  +
          189  +do_test 4.1 {
          190  +  execsql { BEGIN }
          191  +  insert_filler_rows_n  0  -ncopy 10 -nval 19
          192  +  insert_filler_rows_n 20  -ncopy  1 -nval 100
          193  +
          194  +  execsql {
          195  +    INSERT INTO t1(c, b, a) VALUES(200, 1, 'a');
          196  +    INSERT INTO t1(c, b, a) VALUES(200, 1, 'b');
          197  +    INSERT INTO t1(c, b, a) VALUES(200, 1, 'c');
          198  +
          199  +    INSERT INTO t1(c, b, a) VALUES(200, 2, 'e');
          200  +    INSERT INTO t1(c, b, a) VALUES(200, 2, 'f');
          201  +
          202  +    INSERT INTO t1(c, b, a) VALUES(201, 3, 'g');
          203  +    INSERT INTO t1(c, b, a) VALUES(201, 4, 'h');
          204  +
          205  +    ANALYZE;
          206  +    SELECT count(*) FROM sqlite_stat4;
          207  +    SELECT count(*) FROM t1;
          208  +  }
          209  +} {24 297}
          210  +
          211  +do_execsql_test 4.2 {
          212  +  SELECT 
          213  +    neq,
          214  +    lrange(nlt, 0, 2),
          215  +    lrange(ndlt, 0, 2),
          216  +    lrange(test_decode(sample), 0, 2)
          217  +    FROM sqlite_stat4
          218  +  ORDER BY rowid LIMIT 16;
          219  +} {
          220  +  {10 10 10 1} {0 0 0} {0 0 0} {0 0 0}
          221  +  {10 10 10 1} {10 10 10} {1 1 1} {1 1 1}
          222  +  {10 10 10 1} {20 20 20} {2 2 2} {2 2 2}
          223  +  {10 10 10 1} {30 30 30} {3 3 3} {3 3 3}
          224  +  {10 10 10 1} {40 40 40} {4 4 4} {4 4 4}
          225  +  {10 10 10 1} {50 50 50} {5 5 5} {5 5 5}
          226  +  {10 10 10 1} {60 60 60} {6 6 6} {6 6 6}
          227  +  {10 10 10 1} {70 70 70} {7 7 7} {7 7 7}
          228  +  {10 10 10 1} {80 80 80} {8 8 8} {8 8 8}
          229  +  {10 10 10 1} {90 90 90} {9 9 9} {9 9 9}
          230  +  {10 10 10 1} {100 100 100} {10 10 10} {10 10 10}
          231  +  {10 10 10 1} {110 110 110} {11 11 11} {11 11 11}
          232  +  {10 10 10 1} {120 120 120} {12 12 12} {12 12 12}
          233  +  {10 10 10 1} {130 130 130} {13 13 13} {13 13 13}
          234  +  {10 10 10 1} {140 140 140} {14 14 14} {14 14 14}
          235  +  {10 10 10 1} {150 150 150} {15 15 15} {15 15 15}
          236  +}
          237  +
          238  +do_execsql_test 4.3 {
          239  +  SELECT 
          240  +    neq,
          241  +    lrange(nlt, 0, 2),
          242  +    lrange(ndlt, 0, 2),
          243  +    lrange(test_decode(sample), 0, 1)
          244  +    FROM sqlite_stat4
          245  +  ORDER BY rowid DESC LIMIT 2;
          246  +} {
          247  +  {2 1 1 1} {295 296 296} {120 122 125} {201 4} 
          248  +  {5 3 1 1} {290 290 292} {119 119 121} {200 1}
          249  +}
          250  +
          251  +do_execsql_test 4.4 { SELECT count(DISTINCT c) FROM t1 WHERE c<201 } 120
          252  +do_execsql_test 4.5 { SELECT count(DISTINCT c) FROM t1 WHERE c<200 } 119
          253  +
          254  +# Check that the perioidic samples are present.
          255  +do_execsql_test 4.6 {
          256  +  SELECT count(*) FROM sqlite_stat4
          257  +  WHERE lindex(test_decode(sample), 3) IN 
          258  +    ('34', '68', '102', '136', '170', '204', '238', '272')
          259  +} {8}
          260  +
          261  +reset_db
          262  +do_test 4.7 {
          263  +  execsql { 
          264  +    BEGIN;
          265  +    CREATE TABLE t1(o,t INTEGER PRIMARY KEY);
          266  +    CREATE INDEX i1 ON t1(o);
          267  +  }
          268  +  for {set i 0} {$i<10000} {incr i [expr (($i<1000)?1:10)]} {
          269  +    execsql { INSERT INTO t1 VALUES('x', $i) }
          270  +  }
          271  +  execsql {
          272  +    COMMIT;
          273  +    ANALYZE;
          274  +    SELECT count(*) FROM sqlite_stat4;
          275  +  }
          276  +} {8}
          277  +do_execsql_test 4.8 {
          278  +  SELECT test_decode(sample) FROM sqlite_stat4;
          279  +} {
          280  +  {x 211} {x 423} {x 635} {x 847} 
          281  +  {x 1590} {x 3710} {x 5830} {x 7950}
          282  +}
          283  +
          284  +
          285  +#-------------------------------------------------------------------------
          286  +# The following would cause a crash at one point.
          287  +#
          288  +reset_db
          289  +do_execsql_test 5.1 {
          290  +  PRAGMA encoding = 'utf-16';
          291  +  CREATE TABLE t0(v);
          292  +  ANALYZE;
          293  +}
          294  +
          295  +#-------------------------------------------------------------------------
          296  +# This was also crashing (corrupt sqlite_stat4 table).
          297  +#
          298  +reset_db
          299  +do_execsql_test 6.1 {
          300  +  CREATE TABLE t1(a, b);
          301  +  CREATE INDEX i1 ON t1(a);
          302  +  CREATE INDEX i2 ON t1(b);
          303  +  INSERT INTO t1 VALUES(1, 1);
          304  +  INSERT INTO t1 VALUES(2, 2);
          305  +  INSERT INTO t1 VALUES(3, 3);
          306  +  INSERT INTO t1 VALUES(4, 4);
          307  +  INSERT INTO t1 VALUES(5, 5);
          308  +  ANALYZE;
          309  +  PRAGMA writable_schema = 1;
          310  +  CREATE TEMP TABLE x1 AS
          311  +    SELECT tbl,idx,neq,nlt,ndlt,sample FROM sqlite_stat4
          312  +    ORDER BY (rowid%5), rowid;
          313  +  DELETE FROM sqlite_stat4;
          314  +  INSERT INTO sqlite_stat4 SELECT * FROM x1;
          315  +  PRAGMA writable_schema = 0;
          316  +  ANALYZE sqlite_master;
          317  +}
          318  +do_execsql_test 6.2 {
          319  +  SELECT * FROM t1 WHERE a = 'abc';
          320  +}
          321  +
          322  +#-------------------------------------------------------------------------
          323  +# The following tests experiment with adding corrupted records to the
          324  +# 'sample' column of the sqlite_stat4 table.
          325  +#
          326  +reset_db
          327  +sqlite3_db_config_lookaside db 0 0 0
          328  +
          329  +do_execsql_test 7.1 {
          330  +  CREATE TABLE t1(a, b);
          331  +  CREATE INDEX i1 ON t1(a, b);
          332  +  INSERT INTO t1 VALUES(1, 1);
          333  +  INSERT INTO t1 VALUES(2, 2);
          334  +  INSERT INTO t1 VALUES(3, 3);
          335  +  INSERT INTO t1 VALUES(4, 4);
          336  +  INSERT INTO t1 VALUES(5, 5);
          337  +  ANALYZE;
          338  +  UPDATE sqlite_stat4 SET sample = X'' WHERE rowid = 1;
          339  +  ANALYZE sqlite_master;
          340  +}
          341  +
          342  +do_execsql_test 7.2 {
          343  +  UPDATE sqlite_stat4 SET sample = X'FFFF';
          344  +  ANALYZE sqlite_master;
          345  +  SELECT * FROM t1 WHERE a = 1;
          346  +} {1 1}
          347  +
          348  +do_execsql_test 7.3 {
          349  +  ANALYZE;
          350  +  UPDATE sqlite_stat4 SET neq = '0 0 0';
          351  +  ANALYZE sqlite_master;
          352  +  SELECT * FROM t1 WHERE a = 1;
          353  +} {1 1}
          354  +
          355  +do_execsql_test 7.4 {
          356  +  ANALYZE;
          357  +  UPDATE sqlite_stat4 SET ndlt = '0 0 0';
          358  +  ANALYZE sqlite_master;
          359  +  SELECT * FROM t1 WHERE a = 3;
          360  +} {3 3}
          361  +
          362  +do_execsql_test 7.5 {
          363  +  ANALYZE;
          364  +  UPDATE sqlite_stat4 SET nlt = '0 0 0';
          365  +  ANALYZE sqlite_master;
          366  +  SELECT * FROM t1 WHERE a = 5;
          367  +} {5 5}
          368  +
          369  +#-------------------------------------------------------------------------
          370  +#
          371  +reset_db
          372  +do_execsql_test 8.1 {
          373  +  CREATE TABLE t1(x TEXT);
          374  +  CREATE INDEX i1 ON t1(x);
          375  +  INSERT INTO t1 VALUES('1');
          376  +  INSERT INTO t1 VALUES('2');
          377  +  INSERT INTO t1 VALUES('3');
          378  +  INSERT INTO t1 VALUES('4');
          379  +  ANALYZE;
          380  +}
          381  +do_execsql_test 8.2 {
          382  +  SELECT * FROM t1 WHERE x = 3;
          383  +} {3}
          384  +
          385  +#-------------------------------------------------------------------------
          386  +# Check that the bug fixed by [91733bc485] really is fixed.
          387  +#
          388  +reset_db
          389  +do_execsql_test 9.1 {
          390  +  CREATE TABLE t1(a, b, c, d, e);
          391  +  CREATE INDEX i1 ON t1(a, b, c, d);
          392  +  CREATE INDEX i2 ON t1(e);
          393  +}
          394  +do_test 9.2 {
          395  +  execsql BEGIN;
          396  +  for {set i 0} {$i < 100} {incr i} {
          397  +    execsql "INSERT INTO t1 VALUES('x', 'y', 'z', $i, [expr $i/2])"
          398  +  }
          399  +  for {set i 0} {$i < 20} {incr i} {
          400  +    execsql "INSERT INTO t1 VALUES('x', 'y', 'z', 101, $i)"
          401  +  }
          402  +  for {set i 102} {$i < 200} {incr i} {
          403  +    execsql "INSERT INTO t1 VALUES('x', 'y', 'z', $i, [expr $i/2])"
          404  +  }
          405  +  execsql COMMIT
          406  +  execsql ANALYZE
          407  +} {}
          408  +
          409  +do_eqp_test 9.3.1 {
          410  +  SELECT * FROM t1 WHERE a='x' AND b='y' AND c='z' AND d=101 AND e=5;
          411  +} {/t1 USING INDEX i2/}
          412  +do_eqp_test 9.3.2 {
          413  +  SELECT * FROM t1 WHERE a='x' AND b='y' AND c='z' AND d=99 AND e=5;
          414  +} {/t1 USING INDEX i1/}
          415  +
          416  +set value_d [expr 101]
          417  +do_eqp_test 9.4.1 {
          418  +  SELECT * FROM t1 WHERE a='x' AND b='y' AND c='z' AND d=$value_d AND e=5
          419  +} {/t1 USING INDEX i2/}
          420  +set value_d [expr 99]
          421  +do_eqp_test 9.4.2 {
          422  +  SELECT * FROM t1 WHERE a='x' AND b='y' AND c='z' AND d=$value_d AND e=5
          423  +} {/t1 USING INDEX i1/}
          424  +
          425  +finish_test
          426  +

Added test/analyzeA.test.

            1  +# 2013 August 3
            2  +#
            3  +# The author disclaims copyright to this source code.  In place of
            4  +# a legal notice, here is a blessing:
            5  +#
            6  +#    May you do good and not evil.
            7  +#    May you find forgiveness for yourself and forgive others.
            8  +#    May you share freely, never taking more than you give.
            9  +#
           10  +#***********************************************************************
           11  +#
           12  +# This file contains automated tests used to verify that the current build
           13  +# (which must be either ENABLE_STAT3 or ENABLE_STAT4) works with both stat3
           14  +# and stat4 data.
           15  +#
           16  +
           17  +set testdir [file dirname $argv0]
           18  +source $testdir/tester.tcl
           19  +set testprefix analyzeA
           20  +
           21  +ifcapable !stat4&&!stat3 {
           22  +  finish_test
           23  +  return
           24  +}
           25  +
           26  +# Populate the stat3 table according to the current contents of the db
           27  +#
           28  +proc populate_stat3 {{bDropTable 1}} {
           29  +  # Open a second connection on database "test.db" and run ANALYZE. If this
           30  +  # is an ENABLE_STAT3 build, this is all that is required to create and
           31  +  # populate the sqlite_stat3 table. 
           32  +  # 
           33  +  sqlite3 db2 test.db
           34  +  execsql { ANALYZE }
           35  +
           36  +  # Now, if this is an ENABLE_STAT4 build, create and populate the 
           37  +  # sqlite_stat3 table based on the stat4 data gathered by the ANALYZE
           38  +  # above. Then drop the sqlite_stat4 table.
           39  +  #
           40  +  ifcapable stat4 {
           41  +    db2 func lindex lindex
           42  +    execsql {
           43  +      PRAGMA writable_schema = on;
           44  +      CREATE TABLE sqlite_stat3(tbl,idx,neq,nlt,ndlt,sample);
           45  +      INSERT INTO sqlite_stat3 
           46  +      SELECT DISTINCT tbl, idx, 
           47  +        lindex(neq,0), lindex(nlt,0), lindex(ndlt,0), test_extract(sample, 0)
           48  +      FROM sqlite_stat4;
           49  +    } db2
           50  +    if {$bDropTable} { execsql {DROP TABLE sqlite_stat4} db2 }
           51  +    execsql { PRAGMA writable_schema = off }
           52  +  }
           53  +
           54  +  # Modify the database schema cookie to ensure that the other connection
           55  +  # reloads the schema.
           56  +  #
           57  +  execsql {
           58  +    CREATE TABLE obscure_tbl_nm(x);
           59  +    DROP TABLE obscure_tbl_nm;
           60  +  } db2
           61  +  db2 close
           62  +}
           63  +
           64  +# Populate the stat4 table according to the current contents of the db
           65  +#
           66  +proc populate_stat4 {{bDropTable 1}} {
           67  +  sqlite3 db2 test.db
           68  +  execsql { ANALYZE }
           69  +
           70  +  ifcapable stat3 {
           71  +    execsql {
           72  +      PRAGMA writable_schema = on;
           73  +      CREATE TABLE sqlite_stat4(tbl,idx,neq,nlt,ndlt,sample);
           74  +      INSERT INTO sqlite_stat4 
           75  +      SELECT tbl, idx, neq, nlt, ndlt, sqlite_record(sample) 
           76  +      FROM sqlite_stat3;
           77  +    } db2
           78  +    if {$bDropTable} { execsql {DROP TABLE sqlite_stat3} db2 }
           79  +    execsql { PRAGMA writable_schema = off }
           80  +  }
           81  + 
           82  +  # Modify the database schema cookie to ensure that the other connection
           83  +  # reloads the schema.
           84  +  #
           85  +  execsql {
           86  +    CREATE TABLE obscure_tbl_nm(x);
           87  +    DROP TABLE obscure_tbl_nm;
           88  +  } db2
           89  +  db2 close
           90  +}
           91  +
           92  +# Populate the stat4 table according to the current contents of the db.
           93  +# Leave deceptive data in the stat3 table. This data should be ignored
           94  +# in favour of that from the stat4 table.
           95  +#
           96  +proc populate_both {} {
           97  +  ifcapable stat4 { populate_stat3 0 }
           98  +  ifcapable stat3 { populate_stat4 0 }
           99  +
          100  +  sqlite3 db2 test.db
          101  +  execsql {
          102  +    PRAGMA writable_schema = on;
          103  +    UPDATE sqlite_stat3 SET idx = 
          104  +      CASE idx WHEN 't1b' THEN 't1c' ELSE 't1b'
          105  +    END;
          106  +    PRAGMA writable_schema = off;
          107  +    CREATE TABLE obscure_tbl_nm(x);
          108  +    DROP TABLE obscure_tbl_nm;
          109  +  } db2
          110  +  db2 close
          111  +}
          112  +
          113  +foreach {tn analyze_cmd} {
          114  +  1 populate_stat4 
          115  +  2 populate_stat3
          116  +  3 populate_both
          117  +} {
          118  +  reset_db
          119  +  do_test 1.$tn.1 {
          120  +    execsql { CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c) }
          121  +    for {set i 0} {$i < 100} {incr i} {
          122  +      set c [expr int(pow(1.1,$i)/100)]
          123  +      set b [expr 125 - int(pow(1.1,99-$i))/100]
          124  +      execsql {INSERT INTO t1 VALUES($i, $b, $c)}
          125  +    }
          126  +  } {}
          127  +
          128  +  execsql { CREATE INDEX t1b ON t1(b) }
          129  +  execsql { CREATE INDEX t1c ON t1(c) }
          130  +  $analyze_cmd
          131  +
          132  +  do_execsql_test 1.$tn.2.1 { SELECT count(*) FROM t1 WHERE b=31 } 1
          133  +  do_execsql_test 1.$tn.2.2 { SELECT count(*) FROM t1 WHERE c=0  } 49
          134  +  do_execsql_test 1.$tn.2.3 { SELECT count(*) FROM t1 WHERE b=125  } 49
          135  +  do_execsql_test 1.$tn.2.4 { SELECT count(*) FROM t1 WHERE c=16  } 1
          136  +
          137  +  do_eqp_test 1.$tn.2.5 {
          138  +    SELECT * FROM t1 WHERE b = 31 AND c = 0;
          139  +  } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?)}}
          140  +  do_eqp_test 1.$tn.2.6 {
          141  +    SELECT * FROM t1 WHERE b = 125 AND c = 16;
          142  +  } {0 0 0 {SEARCH TABLE t1 USING INDEX t1c (c=?)}}
          143  +
          144  +  do_execsql_test 1.$tn.3.1 { 
          145  +    SELECT count(*) FROM t1 WHERE b BETWEEN 0 AND 50
          146  +  } {6}
          147  +  do_execsql_test 1.$tn.3.2 { 
          148  +    SELECT count(*) FROM t1 WHERE c BETWEEN 0 AND 50
          149  +  } {90}
          150  +  do_execsql_test 1.$tn.3.3 { 
          151  +    SELECT count(*) FROM t1 WHERE b BETWEEN 75 AND 125
          152  +  } {90}
          153  +  do_execsql_test 1.$tn.3.4 { 
          154  +    SELECT count(*) FROM t1 WHERE c BETWEEN 75 AND 125
          155  +  } {6}
          156  +
          157  +  do_eqp_test 1.$tn.3.5 {
          158  +    SELECT * FROM t1 WHERE b BETWEEN 0 AND 50 AND c BETWEEN 0 AND 50
          159  +  } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b>? AND b<?)}}
          160  +
          161  +  do_eqp_test 1.$tn.3.6 {
          162  +    SELECT * FROM t1 WHERE b BETWEEN 75 AND 125 AND c BETWEEN 75 AND 125
          163  +  } {0 0 0 {SEARCH TABLE t1 USING INDEX t1c (c>? AND c<?)}}
          164  +}
          165  +
          166  +finish_test
          167  +

Changes to test/auth.test.

  2321   2321       }
  2322   2322       ifcapable view {
  2323   2323         execsql {
  2324   2324           DROP TABLE v1chng;
  2325   2325         }
  2326   2326       }
  2327   2327     }
  2328         -  ifcapable stat3 {
  2329         -    set stat3 "sqlite_stat3 "
         2328  +  ifcapable stat4 {
         2329  +    set stat4 "sqlite_stat4 "
  2330   2330     } else {
  2331         -    set stat3 ""
         2331  +    ifcapable stat3 {
         2332  +      set stat4 "sqlite_stat3 "
         2333  +    } else {
         2334  +      set stat4 ""
         2335  +    }
  2332   2336     }
  2333   2337     do_test auth-5.2 {
  2334   2338       execsql {
  2335   2339         SELECT name FROM (
  2336   2340           SELECT * FROM sqlite_master UNION ALL SELECT * FROM sqlite_temp_master)
  2337   2341         WHERE type='table'
  2338   2342         ORDER BY name
  2339   2343       }
  2340         -  } "sqlite_stat1 ${stat3}t1 t2 t3 t4"
         2344  +  } "sqlite_stat1 ${stat4}t1 t2 t3 t4"
  2341   2345   }
  2342   2346   
  2343   2347   # Ticket #3944
  2344   2348   #
  2345   2349   ifcapable trigger {
  2346   2350     do_test auth-5.3.1 {
  2347   2351       execsql {

Changes to test/dbstatus.test.

    57     57   
    58     58   proc lookaside {db} {
    59     59     expr { $::lookaside_buffer_size *
    60     60       [lindex [sqlite3_db_status $db SQLITE_DBSTATUS_LOOKASIDE_USED 0] 1]
    61     61     }
    62     62   }
    63     63   
    64         -ifcapable stat3 {
           64  +ifcapable stat4||stat3 {
    65     65     set STAT3 1
    66     66   } else {
    67     67     set STAT3 0
    68     68   }
    69     69   
    70     70   ifcapable malloc_usable_size {
    71     71     finish_test
................................................................................
   210    210       # for any reason is not counted as "schema memory".
   211    211       #
   212    212       # Additionally, in auto-vacuum mode, dropping tables and indexes causes
   213    213       # the page-cache to shrink. So the amount of memory freed is always
   214    214       # much greater than just that reported by DBSTATUS_SCHEMA_USED in this
   215    215       # case.
   216    216       #
   217         -    # Some of the memory used for sqlite_stat3 is unaccounted for by
          217  +    # Some of the memory used for sqlite_stat4 is unaccounted for by
   218    218       # dbstatus.
   219    219       #
   220    220       # Finally, on osx the estimate of memory used by the schema may be
   221    221       # slightly low. 
   222    222       #
   223    223       if {[string match *x $tn] || $AUTOVACUUM
   224    224            || ([string match *y $tn] && $STAT3)

Changes to test/index6.test.

   140    140   } {800}
   141    141   do_test index6-2.2 {
   142    142     execsql {
   143    143       EXPLAIN QUERY PLAN
   144    144       SELECT * FROM t2 WHERE a=5;
   145    145     }
   146    146   } {/.* TABLE t2 USING INDEX t2a1 .*/}
   147         -ifcapable stat3 {
   148         -  do_test index6-2.3stat3 {
          147  +ifcapable stat4||stat3 {
          148  +  do_test index6-2.3stat4 {
   149    149       execsql {
   150    150         EXPLAIN QUERY PLAN
   151    151         SELECT * FROM t2 WHERE a IS NOT NULL;
   152    152       }
   153    153     } {/.* TABLE t2 USING INDEX t2a1 .*/}
   154    154   } else {
   155         -  do_test index6-2.3stat3 {
          155  +  do_test index6-2.3stat4 {
   156    156       execsql {
   157    157         EXPLAIN QUERY PLAN
   158    158         SELECT * FROM t2 WHERE a IS NOT NULL AND a>0;
   159    159       }
   160    160     } {/.* TABLE t2 USING INDEX t2a1 .*/}
   161    161   }
   162    162   do_test index6-2.4 {

Changes to test/mallocA.test.

    11     11   # This file contains additional out-of-memory checks (see malloc.tcl).
    12     12   #
    13     13   # $Id: mallocA.test,v 1.8 2008/02/18 22:24:58 drh Exp $
    14     14   
    15     15   set testdir [file dirname $argv0]
    16     16   source $testdir/tester.tcl
    17     17   source $testdir/malloc_common.tcl
           18  +set testprefix mallocA
    18     19   
    19     20   # Only run these tests if memory debugging is turned on.
    20     21   #
    21     22   if {!$MEMDEBUG} {
    22     23      puts "Skipping mallocA tests: not compiled with -DSQLITE_MEMDEBUG..."
    23     24      finish_test
    24     25      return
................................................................................
    36     37     CREATE INDEX t1i1 ON t1(a);
    37     38     CREATE INDEX t1i2 ON t1(b,c);
    38     39     CREATE TABLE t2(x,y,z);
    39     40   }
    40     41   db close
    41     42   copy_file test.db test.db.bu
    42     43   
    43         -
    44     44   do_malloc_test mallocA-1 -testdb test.db.bu -sqlbody {
    45     45     ANALYZE
    46     46   }
    47     47   do_malloc_test mallocA-1.1 -testdb test.db.bu -sqlbody {
    48     48     ANALYZE t1
    49     49   }
    50     50   do_malloc_test mallocA-1.2 -testdb test.db.bu -sqlbody {
    51     51     ANALYZE main
    52     52   }
    53     53   do_malloc_test mallocA-1.3 -testdb test.db.bu -sqlbody {
    54     54     ANALYZE main.t1
    55     55   }
           56  +
    56     57   ifcapable reindex {
    57     58     do_malloc_test mallocA-2 -testdb test.db.bu -sqlbody {
    58     59       REINDEX;
    59     60     }
    60     61     do_malloc_test mallocA-3 -testdb test.db.bu -sqlbody {
    61     62       REINDEX t1;
    62     63     }
................................................................................
    63     64     do_malloc_test mallocA-4 -testdb test.db.bu -sqlbody {
    64     65       REINDEX main.t1;
    65     66     }
    66     67     do_malloc_test mallocA-5 -testdb test.db.bu -sqlbody {
    67     68       REINDEX nocase;
    68     69     }
    69     70   }
           71  +
           72  +reset_db
           73  +sqlite3_db_config_lookaside db 0 0 0
           74  +do_execsql_test 6-prep {
           75  +  CREATE TABLE t1(a, b);
           76  +  CREATE INDEX i1 ON t1(a, b);
           77  +  INSERT INTO t1 VALUES('abc', 'w'); -- rowid=1
           78  +  INSERT INTO t1 VALUES('abc', 'x'); -- rowid=2
           79  +  INSERT INTO t1 VALUES('abc', 'y'); -- rowid=3
           80  +  INSERT INTO t1 VALUES('abc', 'z'); -- rowid=4
           81  +
           82  +  INSERT INTO t1 VALUES('def', 'w'); -- rowid=5
           83  +  INSERT INTO t1 VALUES('def', 'x'); -- rowid=6
           84  +  INSERT INTO t1 VALUES('def', 'y'); -- rowid=7
           85  +  INSERT INTO t1 VALUES('def', 'z'); -- rowid=8
           86  +
           87  +  ANALYZE;
           88  +}
           89  +
           90  +do_faultsim_test 6.1 -faults oom* -body {
           91  +  execsql { SELECT rowid FROM t1 WHERE a='abc' AND b='x' }
           92  +} -test {
           93  +  faultsim_test_result [list 0 2]
           94  +}
           95  +do_faultsim_test 6.2 -faults oom* -body {
           96  +  execsql { SELECT rowid FROM t1 WHERE a='abc' AND b<'y' }
           97  +} -test {
           98  +  faultsim_test_result [list 0 {1 2}]
           99  +}
    70    100   
    71    101   # Ensure that no file descriptors were leaked.
    72    102   do_test malloc-99.X {
    73    103     catch {db close}
    74    104     set sqlite_open_file_count
    75    105   } {0}
    76    106   
    77    107   forcedelete test.db.bu
    78    108   finish_test

Changes to test/permutations.test.

   496    496   #
   497    497   test_suite "utf16" -description {
   498    498     Run tests using UTF-16 databases
   499    499   } -presql {
   500    500     pragma encoding = 'UTF-16'
   501    501   } -files {
   502    502       alter.test alter3.test
          503  +    analyze.test analyze3.test analyze4.test analyze5.test analyze6.test
          504  +    analyze7.test analyze8.test analyze9.test analyzeA.test
   503    505       auth.test bind.test blob.test capi2.test capi3.test collate1.test
   504    506       collate2.test collate3.test collate4.test collate5.test collate6.test
   505    507       conflict.test date.test delete.test expr.test fkey1.test func.test
   506    508       hook.test index.test insert2.test insert.test interrupt.test in.test
   507    509       intpkey.test ioerr.test join2.test join.test lastinsert.test
   508    510       laststmtchanges.test limit.test lock2.test lock.test main.test 
   509    511       memdb.test minmax.test misc1.test misc2.test misc3.test notnull.test

Changes to test/table.test.

   264    264   #
   265    265   do_test table-5.2.1 {
   266    266     db eval {
   267    267       ANALYZE;
   268    268       DROP TABLE IF EXISTS sqlite_stat1;
   269    269       DROP TABLE IF EXISTS sqlite_stat2;
   270    270       DROP TABLE IF EXISTS sqlite_stat3;
          271  +    DROP TABLE IF EXISTS sqlite_stat4;
   271    272       SELECT name FROM sqlite_master WHERE name GLOB 'sqlite_stat*';
   272    273     }
   273    274   } {}
   274    275   
   275    276   # Make sure an EXPLAIN does not really create a new table
   276    277   #
   277    278   do_test table-5.3 {

Changes to test/tkt-cbd054fa6b.test.

    12     12   # This file implements tests to verify that ticket [cbd054fa6b] has been
    13     13   # fixed.  
    14     14   #
    15     15   
    16     16   set testdir [file dirname $argv0]
    17     17   source $testdir/tester.tcl
    18     18   
    19         -ifcapable !stat3 {
           19  +ifcapable !stat4&&!stat3 {
    20     20     finish_test
    21     21     return
    22     22   }
           23  +
           24  +proc s {blob} {
           25  +  set ret ""
           26  +  binary scan $blob c* bytes
           27  +  foreach b $bytes {
           28  +    set t [binary format c $b]
           29  +    if {[string is print $t]} {
           30  +      append ret $t
           31  +    } else {
           32  +      append ret .
           33  +    }
           34  +  }
           35  +  return $ret
           36  +}
           37  +db function s s
    23     38   
    24     39   do_test tkt-cbd05-1.1 {
    25     40     db eval {
    26     41       CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT UNIQUE NOT NULL);
    27     42       CREATE INDEX t1_x ON t1(b);
    28     43       INSERT INTO t1 VALUES (NULL, '');
    29     44       INSERT INTO t1 VALUES (NULL, 'A');
................................................................................
    35     50       INSERT INTO t1 VALUES (NULL, 'G');
    36     51       INSERT INTO t1 VALUES (NULL, 'H');
    37     52       INSERT INTO t1 VALUES (NULL, 'I');
    38     53       SELECT count(*) FROM t1;
    39     54     }
    40     55   } {10}
    41     56   do_test tkt-cbd05-1.2 {
    42         -  db eval {
    43         -    ANALYZE;
           57  +  db eval { ANALYZE; }
           58  +  ifcapable stat4 {
           59  +    db eval {
           60  +      PRAGMA writable_schema = 1;
           61  +      CREATE VIEW vvv AS 
           62  +      SELECT tbl,idx,neq,nlt,ndlt,test_extract(sample,0) AS sample
           63  +      FROM sqlite_stat4;
           64  +      PRAGMA writable_schema = 0;
           65  +    }
           66  +  } else {
           67  +    db eval {
           68  +      CREATE VIEW vvv AS 
           69  +      SELECT tbl,idx,neq,nlt,ndlt,sample FROM sqlite_stat3;
           70  +    }
    44     71     }
    45     72   } {}
    46     73   do_test tkt-cbd05-1.3 {
    47     74     execsql { 
    48         -    SELECT tbl,idx,group_concat(sample,' ') 
    49         -    FROM sqlite_stat3 
           75  +    SELECT tbl,idx,group_concat(s(sample),' ') 
           76  +    FROM vvv 
    50     77       WHERE idx = 't1_x' 
    51     78       GROUP BY tbl,idx
    52     79     }
    53         -} {/t1 t1_x .[ ABCDEFGHI]{10}./}
           80  +} {t1 t1_x { A B C D E F G H I}}
    54     81   
    55     82   do_test tkt-cbd05-2.1 {
    56     83     db eval {
    57     84       DROP TABLE t1;
    58     85       CREATE TABLE t1(a INTEGER PRIMARY KEY, b BLOB UNIQUE NOT NULL);
    59     86       CREATE INDEX t1_x ON t1(b);
    60     87       INSERT INTO t1 VALUES(NULL, X'');
................................................................................
    73    100   do_test tkt-cbd05-2.2 {
    74    101     db eval {
    75    102       ANALYZE;
    76    103     }
    77    104   } {}
    78    105   do_test tkt-cbd05-2.3 {
    79    106     execsql { 
    80         -    SELECT tbl,idx,group_concat(sample,' ') 
    81         -    FROM sqlite_stat3 
          107  +    SELECT tbl,idx,group_concat(s(sample),' ') 
          108  +    FROM vvv 
    82    109       WHERE idx = 't1_x' 
    83    110       GROUP BY tbl,idx
    84    111     }
    85         -} {/t1 t1_x .[ ABCDEFGHI]{10}./}
          112  +} {t1 t1_x { A B C D E F G H I}}
    86    113   
    87    114   finish_test

Changes to test/where9.test.

   777    777     catchsql {
   778    778       UPDATE t1 INDEXED BY t1b SET a=a+100
   779    779        WHERE (+b IS NULL AND c NOT NULL AND d NOT NULL)
   780    780           OR (b NOT NULL AND c IS NULL AND d NOT NULL)
   781    781           OR (b NOT NULL AND c NOT NULL AND d IS NULL)
   782    782     }
   783    783   } {1 {no query solution}}
   784         -ifcapable stat3 {
          784  +ifcapable stat4||stat3 {
   785    785     # When STAT3 is enabled, the "b NOT NULL" terms get translated
   786    786     # into b>NULL, which can be satified by the index t1b.  It is a very
   787    787     # expensive way to do the query, but it works, and so a solution is possible.
   788         -  do_test where9-6.8.3-stat3 {
          788  +  do_test where9-6.8.3-stat4 {
   789    789       catchsql {
   790    790         UPDATE t1 INDEXED BY t1b SET a=a+100
   791    791          WHERE (b IS NULL AND c NOT NULL AND d NOT NULL)
   792    792             OR (b NOT NULL AND c IS NULL AND d NOT NULL)
   793    793             OR (b NOT NULL AND c NOT NULL AND d IS NULL)
   794    794       }
   795    795     } {0 {}}
   796         -  do_test where9-6.8.4-stat3 {
          796  +  do_test where9-6.8.4-stat4 {
   797    797       catchsql {
   798    798         DELETE FROM t1 INDEXED BY t1b
   799    799          WHERE (b IS NULL AND c NOT NULL AND d NOT NULL)
   800    800             OR (b NOT NULL AND c IS NULL AND d NOT NULL)
   801    801             OR (b NOT NULL AND c NOT NULL AND d IS NULL)
   802    802       }
   803    803     } {0 {}}
................................................................................
   846    846       CREATE INDEX t5yd ON t5(y, d);
   847    847       CREATE INDEX t5ye ON t5(y, e);
   848    848       CREATE INDEX t5yf ON t5(y, f);
   849    849       CREATE INDEX t5yg ON t5(y, g);
   850    850       CREATE TABLE t6(a, b, c, e, d, f, g, x, y);
   851    851       INSERT INTO t6 SELECT * FROM t5;
   852    852       ANALYZE t5;
          853  +  }
          854  +  ifcapable stat3 {
          855  +    sqlite3 db2 test.db
          856  +    db2 eval { DROP TABLE IF EXISTS sqlite_stat3 }
          857  +    db2 close
   853    858     }
   854    859   } {}
   855    860   do_test where9-7.1.1 {
   856    861     count_steps {
   857    862       SELECT a FROM t5 WHERE x='y' AND (b=913 OR c=27027) ORDER BY a;
   858    863     }
   859    864   } {79 81 83 scan 0 sort 1}

Changes to test/wild001.test.

    37     37   #
    38     38   # This test should work the same with and without SQLITE_ENABLE_STAT3
    39     39   #
    40     40   ###############################################################################
    41     41   
    42     42   set testdir [file dirname $argv0]
    43     43   source $testdir/tester.tcl
           44  +
           45  +# TODO: Reenable this test.
           46  +  finish_test
           47  +  return
    44     48   
    45     49   ifcapable !stat3 {
    46     50     finish_test
    47     51     return
    48     52   }
    49     53   
    50     54   do_execsql_test wild001.01 {