SQLite

Check-in [dddd7e1829]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Optimizations for the matchinfo() function, particularly the 'y' flag.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | fts3-matchinfo-y
Files: files | file ages | folders
SHA1: dddd7e182943a1d3a9d32830e819a63f1a228d6d
User & Date: dan 2015-05-05 19:37:07.819
Context
2015-05-05
20:39
Add the fts3 matchinfo 'b' flag. (check-in: b9b77972d8 user: dan tags: fts3-matchinfo-y)
19:37
Optimizations for the matchinfo() function, particularly the 'y' flag. (check-in: dddd7e1829 user: dan tags: fts3-matchinfo-y)
11:08
Add #ifdef statements to test_blob.c so that it will build with SQLITE_OMIT_INCRBLOB. (check-in: b8f090e65d user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to ext/fts3/fts3.c.
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
static int fts3CloseMethod(sqlite3_vtab_cursor *pCursor){
  Fts3Cursor *pCsr = (Fts3Cursor *)pCursor;
  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
  sqlite3_finalize(pCsr->pStmt);
  sqlite3Fts3ExprFree(pCsr->pExpr);
  sqlite3Fts3FreeDeferredTokens(pCsr);
  sqlite3_free(pCsr->aDoclist);
  sqlite3_free(pCsr->aMatchinfo);
  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
  sqlite3_free(pCsr);
  return SQLITE_OK;
}

/*
** If pCsr->pStmt has not been prepared (i.e. if pCsr->pStmt==0), then







|







1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
static int fts3CloseMethod(sqlite3_vtab_cursor *pCursor){
  Fts3Cursor *pCsr = (Fts3Cursor *)pCursor;
  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
  sqlite3_finalize(pCsr->pStmt);
  sqlite3Fts3ExprFree(pCsr->pExpr);
  sqlite3Fts3FreeDeferredTokens(pCsr);
  sqlite3_free(pCsr->aDoclist);
  sqlite3Fts3MIBufferFree(pCsr->pMIBuffer);
  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
  sqlite3_free(pCsr);
  return SQLITE_OK;
}

/*
** If pCsr->pStmt has not been prepared (i.e. if pCsr->pStmt==0), then
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
  if( idxNum & FTS3_HAVE_DOCID_GE ) pDocidGe = apVal[iIdx++];
  if( idxNum & FTS3_HAVE_DOCID_LE ) pDocidLe = apVal[iIdx++];
  assert( iIdx==nVal );

  /* In case the cursor has been used before, clear it now. */
  sqlite3_finalize(pCsr->pStmt);
  sqlite3_free(pCsr->aDoclist);
  sqlite3_free(pCsr->aMatchinfo);
  sqlite3Fts3ExprFree(pCsr->pExpr);
  memset(&pCursor[1], 0, sizeof(Fts3Cursor)-sizeof(sqlite3_vtab_cursor));

  /* Set the lower and upper bounds on docids to return */
  pCsr->iMinDocid = fts3DocidRange(pDocidGe, SMALLEST_INT64);
  pCsr->iMaxDocid = fts3DocidRange(pDocidLe, LARGEST_INT64);








|







3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
  if( idxNum & FTS3_HAVE_DOCID_GE ) pDocidGe = apVal[iIdx++];
  if( idxNum & FTS3_HAVE_DOCID_LE ) pDocidLe = apVal[iIdx++];
  assert( iIdx==nVal );

  /* In case the cursor has been used before, clear it now. */
  sqlite3_finalize(pCsr->pStmt);
  sqlite3_free(pCsr->aDoclist);
  sqlite3Fts3MIBufferFree(pCsr->pMIBuffer);
  sqlite3Fts3ExprFree(pCsr->pExpr);
  memset(&pCursor[1], 0, sizeof(Fts3Cursor)-sizeof(sqlite3_vtab_cursor));

  /* Set the lower and upper bounds on docids to return */
  pCsr->iMinDocid = fts3DocidRange(pDocidGe, SMALLEST_INT64);
  pCsr->iMaxDocid = fts3DocidRange(pDocidLe, LARGEST_INT64);

Changes to ext/fts3/fts3Int.h.
193
194
195
196
197
198
199


200
201
202
203
204
205
206

typedef struct Fts3Doclist Fts3Doclist;
typedef struct Fts3SegFilter Fts3SegFilter;
typedef struct Fts3DeferredToken Fts3DeferredToken;
typedef struct Fts3SegReader Fts3SegReader;
typedef struct Fts3MultiSegReader Fts3MultiSegReader;



/*
** A connection to a fulltext index is an instance of the following
** structure. The xCreate and xConnect methods create an instance
** of this structure and xDestroy and xDisconnect free that instance.
** All other methods receive a pointer to the structure as one of their
** arguments.
*/







>
>







193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208

typedef struct Fts3Doclist Fts3Doclist;
typedef struct Fts3SegFilter Fts3SegFilter;
typedef struct Fts3DeferredToken Fts3DeferredToken;
typedef struct Fts3SegReader Fts3SegReader;
typedef struct Fts3MultiSegReader Fts3MultiSegReader;

typedef struct MatchinfoBuffer MatchinfoBuffer;

/*
** A connection to a fulltext index is an instance of the following
** structure. The xCreate and xConnect methods create an instance
** of this structure and xDestroy and xDisconnect free that instance.
** All other methods receive a pointer to the structure as one of their
** arguments.
*/
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
  u8 bDesc;                       /* True to sort in descending order */
  int eEvalmode;                  /* An FTS3_EVAL_XX constant */
  int nRowAvg;                    /* Average size of database rows, in pages */
  sqlite3_int64 nDoc;             /* Documents in table */
  i64 iMinDocid;                  /* Minimum docid to return */
  i64 iMaxDocid;                  /* Maximum docid to return */
  int isMatchinfoNeeded;          /* True when aMatchinfo[] needs filling in */
  u32 *aMatchinfo;                /* Information about most recent match */
  int nMatchinfo;                 /* Number of elements in aMatchinfo[] */
  char *zMatchinfo;               /* Matchinfo specification */
};

#define FTS3_EVAL_FILTER    0
#define FTS3_EVAL_NEXT      1
#define FTS3_EVAL_MATCHINFO 2

/*







<
<
|







304
305
306
307
308
309
310


311
312
313
314
315
316
317
318
  u8 bDesc;                       /* True to sort in descending order */
  int eEvalmode;                  /* An FTS3_EVAL_XX constant */
  int nRowAvg;                    /* Average size of database rows, in pages */
  sqlite3_int64 nDoc;             /* Documents in table */
  i64 iMinDocid;                  /* Minimum docid to return */
  i64 iMaxDocid;                  /* Maximum docid to return */
  int isMatchinfoNeeded;          /* True when aMatchinfo[] needs filling in */


  MatchinfoBuffer *pMIBuffer;     /* Buffer for matchinfo data */
};

#define FTS3_EVAL_FILTER    0
#define FTS3_EVAL_NEXT      1
#define FTS3_EVAL_MATCHINFO 2

/*
560
561
562
563
564
565
566

567
568
569
570
571
572
573

/* fts3_snippet.c */
void sqlite3Fts3Offsets(sqlite3_context*, Fts3Cursor*);
void sqlite3Fts3Snippet(sqlite3_context *, Fts3Cursor *, const char *,
  const char *, const char *, int, int
);
void sqlite3Fts3Matchinfo(sqlite3_context *, Fts3Cursor *, const char *);


/* fts3_expr.c */
int sqlite3Fts3ExprParse(sqlite3_tokenizer *, int,
  char **, int, int, int, const char *, int, Fts3Expr **, char **
);
void sqlite3Fts3ExprFree(Fts3Expr *);
#ifdef SQLITE_TEST







>







560
561
562
563
564
565
566
567
568
569
570
571
572
573
574

/* fts3_snippet.c */
void sqlite3Fts3Offsets(sqlite3_context*, Fts3Cursor*);
void sqlite3Fts3Snippet(sqlite3_context *, Fts3Cursor *, const char *,
  const char *, const char *, int, int
);
void sqlite3Fts3Matchinfo(sqlite3_context *, Fts3Cursor *, const char *);
void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p);

/* fts3_expr.c */
int sqlite3Fts3ExprParse(sqlite3_tokenizer *, int,
  char **, int, int, int, const char *, int, Fts3Expr **, char **
);
void sqlite3Fts3ExprFree(Fts3Expr *);
#ifdef SQLITE_TEST
Changes to ext/fts3/fts3_snippet.c.
88
89
90
91
92
93
94












95
96
97
98
99
100
101
102
103
104
105
106
107
108



























































































109
110
111
112
113
114
115
  Fts3Cursor *pCursor;            /* FTS3 Cursor */
  int nCol;                       /* Number of columns in table */
  int nPhrase;                    /* Number of matchable phrases in query */
  sqlite3_int64 nDoc;             /* Number of docs in database */
  u32 *aMatchinfo;                /* Pre-allocated buffer */
};















/*
** The snippet() and offsets() functions both return text values. An instance
** of the following structure is used to accumulate those values while the
** functions are running. See fts3StringAppend() for details.
*/
typedef struct StrBuffer StrBuffer;
struct StrBuffer {
  char *z;                        /* Pointer to buffer containing string */
  int n;                          /* Length of z in bytes (excl. nul-term) */
  int nAlloc;                     /* Allocated size of buffer z in bytes */
};





























































































/*
** This function is used to help iterate through a position-list. A position
** list is a list of unique integers, sorted from smallest to largest. Each
** element of the list is represented by an FTS3 varint that takes the value
** of the difference between the current element and the previous one plus
** two. For example, to store the position-list:







>
>
>
>
>
>
>
>
>
>
>
>














>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>







88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
  Fts3Cursor *pCursor;            /* FTS3 Cursor */
  int nCol;                       /* Number of columns in table */
  int nPhrase;                    /* Number of matchable phrases in query */
  sqlite3_int64 nDoc;             /* Number of docs in database */
  u32 *aMatchinfo;                /* Pre-allocated buffer */
};

/*
** An instance of this structure is used to manage a pair of buffers, each
** (nElem * sizeof(u32)) bytes in size. See the MatchinfoBuffer code below
** for details.
*/
struct MatchinfoBuffer {
  u8 aRef[3];
  int nElem;
  int bGlobal;                    /* Set if global data is loaded */
  char *zMatchinfo;
  u32 aMatchinfo[0];
};


/*
** The snippet() and offsets() functions both return text values. An instance
** of the following structure is used to accumulate those values while the
** functions are running. See fts3StringAppend() for details.
*/
typedef struct StrBuffer StrBuffer;
struct StrBuffer {
  char *z;                        /* Pointer to buffer containing string */
  int n;                          /* Length of z in bytes (excl. nul-term) */
  int nAlloc;                     /* Allocated size of buffer z in bytes */
};


/*************************************************************************
** Start of MatchinfoBuffer code.
*/

/*
** Allocate a two-slot MatchinfoBuffer object.
*/
static MatchinfoBuffer *fts3MIBufferNew(int nElem, const char *zMatchinfo){
  MatchinfoBuffer *pRet;
  int nByte = sizeof(u32) * (2*nElem + 2) + sizeof(MatchinfoBuffer);
  int nStr = strlen(zMatchinfo);

  pRet = sqlite3_malloc(nByte + nStr+1);
  if( pRet ){
    memset(pRet, 0, nByte);
    pRet->aMatchinfo[0] = (u8*)(&pRet->aMatchinfo[1]) - (u8*)pRet;
    pRet->aMatchinfo[1+nElem] = pRet->aMatchinfo[0] + sizeof(u32)*(nElem+1);
    pRet->nElem = nElem;
    pRet->zMatchinfo = ((char*)pRet) + nByte;
    memcpy(pRet->zMatchinfo, zMatchinfo, nStr+1);
    pRet->aRef[0] = 1;
  }

  return pRet;
}

static void fts3MIBufferFree(void *p){
  MatchinfoBuffer *pBuf = (MatchinfoBuffer*)((u8*)p - ((u32*)p)[-1]);

  assert( (u32*)p==&pBuf->aMatchinfo[1] 
       || (u32*)p==&pBuf->aMatchinfo[pBuf->nElem+2] 
  );
  if( (u32*)p==&pBuf->aMatchinfo[1] ){
    pBuf->aRef[1] = 0;
  }else{
    pBuf->aRef[2] = 0;
  }

  if( pBuf->aRef[0]==0 && pBuf->aRef[1]==0 && pBuf->aRef[2]==0 ){
    sqlite3_free(pBuf);
  }
}

static void (*fts3MIBufferAlloc(MatchinfoBuffer *p, u32 **paOut))(void*){
  void (*xRet)(void*) = 0;
  u32 *aOut = 0;

  if( p->aRef[1]==0 ){
    p->aRef[1] = 1;
    aOut = &p->aMatchinfo[1];
    xRet = fts3MIBufferFree;
  }
  else if( p->aRef[2]==0 ){
    p->aRef[2] = 1;
    aOut = &p->aMatchinfo[p->nElem+2];
    xRet = fts3MIBufferFree;
  }else{
    aOut = (u32*)sqlite3_malloc(p->nElem * sizeof(u32));
    if( aOut ){
      xRet = sqlite3_free;
      if( p->bGlobal ) memcpy(aOut, &p->aMatchinfo[1], p->nElem*sizeof(u32));
    }
  }

  *paOut = aOut;
  return xRet;
}

static void fts3MIBufferSetGlobal(MatchinfoBuffer *p){
  p->bGlobal = 1;
  memcpy(&p->aMatchinfo[2+p->nElem], &p->aMatchinfo[1], p->nElem*sizeof(u32));
}

/*
** Free a MatchinfoBuffer object allocated using fts3MIBufferNew()
*/
void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p){
  if( p ){
    assert( p->aRef[0]==1 );
    p->aRef[0] = 0;
    if( p->aRef[0]==0 && p->aRef[1]==0 && p->aRef[2]==0 ){
      sqlite3_free(p);
    }
  }
}

/* 
** End of MatchinfoBuffer code.
*************************************************************************/


/*
** This function is used to help iterate through a position-list. A position
** list is a list of unique integers, sorted from smallest to largest. Each
** element of the list is represented by an FTS3 varint that takes the value
** of the difference between the current element and the previous one plus
** two. For example, to store the position-list:
129
130
131
132
133
134
135


136
137
138
139
140
141
142
143
144
145
146
147




148
149
150
151
152
153
154
155
156

157
158
159
160
161
162
163
*/
static void fts3GetDeltaPosition(char **pp, int *piPos){
  int iVal;
  *pp += fts3GetVarint32(*pp, &iVal);
  *piPos += (iVal-2);
}



/*
** Helper function for fts3ExprIterate() (see below).
*/
static int fts3ExprIterate2(
  Fts3Expr *pExpr,                /* Expression to iterate phrases of */
  int *piPhrase,                  /* Pointer to phrase counter */
  int (*x)(Fts3Expr*,int,void*),  /* Callback function to invoke for phrases */
  void *pCtx                      /* Second argument to pass to callback */
){
  int rc;                         /* Return code */
  int eType = pExpr->eType;       /* Type of expression node pExpr */





  if( eType!=FTSQUERY_PHRASE ){
    assert( pExpr->pLeft && pExpr->pRight );
    rc = fts3ExprIterate2(pExpr->pLeft, piPhrase, x, pCtx);
    if( rc==SQLITE_OK && eType!=FTSQUERY_NOT ){
      rc = fts3ExprIterate2(pExpr->pRight, piPhrase, x, pCtx);
    }
  }else{
    rc = x(pExpr, *piPhrase, pCtx);
    (*piPhrase)++;

  }
  return rc;
}

/*
** Iterate through all phrase nodes in an FTS3 query, except those that
** are part of a sub-tree that is the right-hand-side of a NOT operator.







>
>










<

>
>
>
>
|
|
|
|
|
|
|
|
|
>







232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250

251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
*/
static void fts3GetDeltaPosition(char **pp, int *piPos){
  int iVal;
  *pp += fts3GetVarint32(*pp, &iVal);
  *piPos += (iVal-2);
}

static int fts3ExprLHitsCb(Fts3Expr*,int,void*);

/*
** Helper function for fts3ExprIterate() (see below).
*/
static int fts3ExprIterate2(
  Fts3Expr *pExpr,                /* Expression to iterate phrases of */
  int *piPhrase,                  /* Pointer to phrase counter */
  int (*x)(Fts3Expr*,int,void*),  /* Callback function to invoke for phrases */
  void *pCtx                      /* Second argument to pass to callback */
){
  int rc;                         /* Return code */


  if( x==fts3ExprLHitsCb && pExpr->bEof ){
    rc = SQLITE_OK;
  }else{
    int eType = pExpr->eType;     /* Type of expression node pExpr */
    if( eType!=FTSQUERY_PHRASE ){
      assert( pExpr->pLeft && pExpr->pRight );
      rc = fts3ExprIterate2(pExpr->pLeft, piPhrase, x, pCtx);
      if( rc==SQLITE_OK && eType!=FTSQUERY_NOT ){
        rc = fts3ExprIterate2(pExpr->pRight, piPhrase, x, pCtx);
      }
    }else{
      rc = x(pExpr, *piPhrase, pCtx);
      (*piPhrase)++;
    }
  }
  return rc;
}

/*
** Iterate through all phrase nodes in an FTS3 query, except those that
** are part of a sub-tree that is the right-hand-side of a NOT operator.
815
816
817
818
819
820
821
822
823
824
825
826

827
828
829
830
831
832
833
834
835
836
837
838


839
840
841
842
843
844
845
** directive 'y'.
*/
static int fts3ExprLHitsCb(
  Fts3Expr *pExpr,                /* Phrase expression node */
  int iPhrase,                    /* Phrase number */
  void *pCtx                      /* Pointer to MatchInfo structure */
){
  MatchInfo *p = (MatchInfo *)pCtx;
  Fts3Table *pTab = (Fts3Table *)p->pCursor->base.pVtab;
  int rc = SQLITE_OK;
  int iStart = iPhrase * p->nCol;
  Fts3Expr *pEof;                 /* Ancestor node already at EOF */

  
  /* This must be a phrase */
  assert( pExpr->pPhrase );

  /* Initialize all output integers to zero. */
  memset(&p->aMatchinfo[iStart], 0, sizeof(u32) * p->nCol);

  /* Check if this or any parent node is at EOF. If so, then all output
  ** values are zero.  */
  for(pEof=pExpr; pEof && pEof->bEof==0; pEof=pEof->pParent);

  if( pEof==0 && pExpr->iDocid==p->pCursor->iPrevId ){


    Fts3Phrase *pPhrase = pExpr->pPhrase;
    char *pIter = pPhrase->doclist.pList;
    int iCol = 0;

    while( 1 ){
      int nHit = fts3ColumnlistCount(&pIter);
      if( (pPhrase->iColumn>=pTab->nColumn || pPhrase->iColumn==iCol) ){







<
<

<
<
>




<
<
<
<
<
<
<
|
>
>







924
925
926
927
928
929
930


931


932
933
934
935
936







937
938
939
940
941
942
943
944
945
946
** directive 'y'.
*/
static int fts3ExprLHitsCb(
  Fts3Expr *pExpr,                /* Phrase expression node */
  int iPhrase,                    /* Phrase number */
  void *pCtx                      /* Pointer to MatchInfo structure */
){


  int rc = SQLITE_OK;


  MatchInfo *p = (MatchInfo *)pCtx;
  
  /* This must be a phrase */
  assert( pExpr->pPhrase );








  if( pExpr->iDocid==p->pCursor->iPrevId ){
    Fts3Table *pTab = (Fts3Table *)p->pCursor->base.pVtab;
    int iStart = iPhrase * p->nCol;
    Fts3Phrase *pPhrase = pExpr->pPhrase;
    char *pIter = pPhrase->doclist.pList;
    int iCol = 0;

    while( 1 ){
      int nHit = fts3ColumnlistCount(&pIter);
      if( (pPhrase->iColumn>=pTab->nColumn || pPhrase->iColumn==iCol) ){
1145
1146
1147
1148
1149
1150
1151
1152


1153
1154

1155
1156
1157
1158
1159
1160
1161
      case FTS3_MATCHINFO_LCS:
        rc = fts3ExprLoadDoclists(pCsr, 0, 0);
        if( rc==SQLITE_OK ){
          rc = fts3MatchinfoLcs(pCsr, pInfo);
        }
        break;

      case FTS3_MATCHINFO_LHITS:


        (void)fts3ExprIterate(pCsr->pExpr, fts3ExprLHitsCb, (void*)pInfo);
        break;


      default: {
        Fts3Expr *pExpr;
        assert( zArg[i]==FTS3_MATCHINFO_HITS );
        pExpr = pCsr->pExpr;
        rc = fts3ExprLoadDoclists(pCsr, 0, 0);
        if( rc!=SQLITE_OK ) break;







|
>
>


>







1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
      case FTS3_MATCHINFO_LCS:
        rc = fts3ExprLoadDoclists(pCsr, 0, 0);
        if( rc==SQLITE_OK ){
          rc = fts3MatchinfoLcs(pCsr, pInfo);
        }
        break;

      case FTS3_MATCHINFO_LHITS: {
        int nZero = fts3MatchinfoSize(pInfo, FTS3_MATCHINFO_LHITS)*sizeof(u32);
        memset(pInfo->aMatchinfo, 0, nZero);
        (void)fts3ExprIterate(pCsr->pExpr, fts3ExprLHitsCb, (void*)pInfo);
        break;
      }

      default: {
        Fts3Expr *pExpr;
        assert( zArg[i]==FTS3_MATCHINFO_HITS );
        pExpr = pCsr->pExpr;
        rc = fts3ExprLoadDoclists(pCsr, 0, 0);
        if( rc!=SQLITE_OK ) break;
1181
1182
1183
1184
1185
1186
1187

1188
1189
1190
1191
1192
1193
1194
1195



1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241








1242
1243
1244
1245




1246






1247
1248
1249
1250
1251
1252
1253


/*
** Populate pCsr->aMatchinfo[] with data for the current row. The 
** 'matchinfo' data is an array of 32-bit unsigned integers (C type u32).
*/
static int fts3GetMatchinfo(

  Fts3Cursor *pCsr,               /* FTS3 Cursor object */
  const char *zArg                /* Second argument to matchinfo() function */
){
  MatchInfo sInfo;
  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
  int rc = SQLITE_OK;
  int bGlobal = 0;                /* Collect 'global' stats as well as local */




  memset(&sInfo, 0, sizeof(MatchInfo));
  sInfo.pCursor = pCsr;
  sInfo.nCol = pTab->nColumn;

  /* If there is cached matchinfo() data, but the format string for the 
  ** cache does not match the format string for this request, discard 
  ** the cached data. */
  if( pCsr->zMatchinfo && strcmp(pCsr->zMatchinfo, zArg) ){
    assert( pCsr->aMatchinfo );
    sqlite3_free(pCsr->aMatchinfo);
    pCsr->zMatchinfo = 0;
    pCsr->aMatchinfo = 0;
  }

  /* If Fts3Cursor.aMatchinfo[] is NULL, then this is the first time the
  ** matchinfo function has been called for this query. In this case 
  ** allocate the array used to accumulate the matchinfo data and
  ** initialize those elements that are constant for every row.
  */
  if( pCsr->aMatchinfo==0 ){
    int nMatchinfo = 0;           /* Number of u32 elements in match-info */
    int nArg;                     /* Bytes in zArg */
    int i;                        /* Used to iterate through zArg */

    /* Determine the number of phrases in the query */
    pCsr->nPhrase = fts3ExprPhraseCount(pCsr->pExpr);
    sInfo.nPhrase = pCsr->nPhrase;

    /* Determine the number of integers in the buffer returned by this call. */
    for(i=0; zArg[i]; i++){
      nMatchinfo += fts3MatchinfoSize(&sInfo, zArg[i]);
    }

    /* Allocate space for Fts3Cursor.aMatchinfo[] and Fts3Cursor.zMatchinfo. */
    nArg = (int)strlen(zArg);
    pCsr->aMatchinfo = (u32 *)sqlite3_malloc(sizeof(u32)*nMatchinfo + nArg + 1);
    if( !pCsr->aMatchinfo ) return SQLITE_NOMEM;

    pCsr->zMatchinfo = (char *)&pCsr->aMatchinfo[nMatchinfo];
    pCsr->nMatchinfo = nMatchinfo;
    memcpy(pCsr->zMatchinfo, zArg, nArg+1);
    memset(pCsr->aMatchinfo, 0, sizeof(u32)*nMatchinfo);
    pCsr->isMatchinfoNeeded = 1;
    bGlobal = 1;
  }









  sInfo.aMatchinfo = pCsr->aMatchinfo;
  sInfo.nPhrase = pCsr->nPhrase;
  if( pCsr->isMatchinfoNeeded ){
    rc = fts3MatchinfoValues(pCsr, bGlobal, &sInfo, zArg);




    pCsr->isMatchinfoNeeded = 0;






  }

  return rc;
}

/*
** Implementation of snippet() function.







>








>
>
>







|
<
|
|
<


|




|














|
<
|

<
<
<
<




>
>
>
>
>
>
>
>
|
|
<

>
>
>
>
|
>
>
>
>
>
>







1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311

1312
1313

1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336

1337
1338




1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352

1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371


/*
** Populate pCsr->aMatchinfo[] with data for the current row. The 
** 'matchinfo' data is an array of 32-bit unsigned integers (C type u32).
*/
static int fts3GetMatchinfo(
  sqlite3_context *pCtx,        /* Return results here */
  Fts3Cursor *pCsr,               /* FTS3 Cursor object */
  const char *zArg                /* Second argument to matchinfo() function */
){
  MatchInfo sInfo;
  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
  int rc = SQLITE_OK;
  int bGlobal = 0;                /* Collect 'global' stats as well as local */

  u32 *aOut = 0;
  void (*xDestroyOut)(void*) = 0;

  memset(&sInfo, 0, sizeof(MatchInfo));
  sInfo.pCursor = pCsr;
  sInfo.nCol = pTab->nColumn;

  /* If there is cached matchinfo() data, but the format string for the 
  ** cache does not match the format string for this request, discard 
  ** the cached data. */
  if( pCsr->pMIBuffer && strcmp(pCsr->pMIBuffer->zMatchinfo, zArg) ){

    sqlite3Fts3MIBufferFree(pCsr->pMIBuffer);
    pCsr->pMIBuffer = 0;

  }

  /* If Fts3Cursor.pMIBuffer is NULL, then this is the first time the
  ** matchinfo function has been called for this query. In this case 
  ** allocate the array used to accumulate the matchinfo data and
  ** initialize those elements that are constant for every row.
  */
  if( pCsr->pMIBuffer==0 ){
    int nMatchinfo = 0;           /* Number of u32 elements in match-info */
    int nArg;                     /* Bytes in zArg */
    int i;                        /* Used to iterate through zArg */

    /* Determine the number of phrases in the query */
    pCsr->nPhrase = fts3ExprPhraseCount(pCsr->pExpr);
    sInfo.nPhrase = pCsr->nPhrase;

    /* Determine the number of integers in the buffer returned by this call. */
    for(i=0; zArg[i]; i++){
      nMatchinfo += fts3MatchinfoSize(&sInfo, zArg[i]);
    }

    /* Allocate space for Fts3Cursor.aMatchinfo[] and Fts3Cursor.zMatchinfo. */
    pCsr->pMIBuffer = fts3MIBufferNew(nMatchinfo, zArg);

    if( !pCsr->pMIBuffer ) rc = SQLITE_NOMEM;





    pCsr->isMatchinfoNeeded = 1;
    bGlobal = 1;
  }

  if( rc==SQLITE_OK ){
    xDestroyOut = fts3MIBufferAlloc(pCsr->pMIBuffer, &aOut);
    if( xDestroyOut==0 ){
      rc = SQLITE_NOMEM;
    }
  }

  if( rc==SQLITE_OK ){
    sInfo.aMatchinfo = aOut;
    sInfo.nPhrase = pCsr->nPhrase;

    rc = fts3MatchinfoValues(pCsr, bGlobal, &sInfo, zArg);
    if( bGlobal ){
      fts3MIBufferSetGlobal(pCsr->pMIBuffer);
    }
  }

  if( rc!=SQLITE_OK ){
    sqlite3_result_error_code(pCtx, rc);
    if( xDestroyOut ) xDestroyOut(aOut);
  }else{
    int n = pCsr->pMIBuffer->nElem * sizeof(u32);
    sqlite3_result_blob(pCtx, aOut, n, xDestroyOut);
  }

  return rc;
}

/*
** Implementation of snippet() function.
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582

  if( !pCsr->pExpr ){
    sqlite3_result_blob(pContext, "", 0, SQLITE_STATIC);
    return;
  }

  /* Retrieve matchinfo() data. */
  rc = fts3GetMatchinfo(pCsr, zFormat);
  sqlite3Fts3SegmentsClose(pTab);

  if( rc!=SQLITE_OK ){
    sqlite3_result_error_code(pContext, rc);
  }else{
    int n = pCsr->nMatchinfo * sizeof(u32);
    sqlite3_result_blob(pContext, pCsr->aMatchinfo, n, SQLITE_TRANSIENT);
  }
}

#endif







|

<
<
<
<
<
<
<



1682
1683
1684
1685
1686
1687
1688
1689
1690







1691
1692
1693

  if( !pCsr->pExpr ){
    sqlite3_result_blob(pContext, "", 0, SQLITE_STATIC);
    return;
  }

  /* Retrieve matchinfo() data. */
  rc = fts3GetMatchinfo(pContext, pCsr, zFormat);
  sqlite3Fts3SegmentsClose(pTab);







}

#endif