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Overview
Comment: | Ensure the columns of views and sub-queries maintain their implicit collation sequences when the "push-down" optimization is applied. Fix for [18458b1a]. |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
36997c4ade2ef3a274cd1ac52b44118f |
User & Date: | dan 2019-09-10 15:33:52 |
Context
2019-09-10
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17:51 | Enhance treeview to show SOFT-COLLATE for TK_COLLATE operators that omit the EP_Collate flag. check-in: a97804620a user: drh tags: trunk | |
15:33 | Ensure the columns of views and sub-queries maintain their implicit collation sequences when the "push-down" optimization is applied. Fix for [18458b1a]. check-in: 36997c4ade user: dan tags: trunk | |
2019-09-09
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20:17 | Ensure the columns of views and sub-selects in the FROM clause of a select are always assigned implicit collation sequences, just as table columns are. Fix for [a7debbe0]. check-in: b9ec72203c user: dan tags: trunk | |
Changes
Changes to src/select.c.
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*/ typedef struct SubstContext { Parse *pParse; /* The parsing context */ int iTable; /* Replace references to this table */ int iNewTable; /* New table number */ int isLeftJoin; /* Add TK_IF_NULL_ROW opcodes on each replacement */ ExprList *pEList; /* Replacement expressions */ int bFlattener; /* True for query-flattener, false otherwise */ } SubstContext; /* Forward Declarations */ static void substExprList(SubstContext*, ExprList*); static void substSelect(SubstContext*, Select*, int); /* ................................................................................ if( pNew && ExprHasProperty(pExpr,EP_FromJoin) ){ pNew->iRightJoinTable = pExpr->iRightJoinTable; ExprSetProperty(pNew, EP_FromJoin); } sqlite3ExprDelete(db, pExpr); pExpr = pNew; /* If this call is part of query-flattening, ensure that the ** new expression has an implicit collation sequence. */ if( pSubst->bFlattener && pExpr ){ if( pExpr->op!=TK_COLUMN && pExpr->op!=TK_COLLATE ){ CollSeq *pColl = sqlite3ExprCollSeq(pSubst->pParse, pExpr); pExpr = sqlite3ExprAddCollateString(pSubst->pParse, pExpr, (pColl ? pColl->zName : "BINARY") ); } ExprClearProperty(pExpr, EP_Collate); ................................................................................ if( db->mallocFailed==0 ){ SubstContext x; x.pParse = pParse; x.iTable = iParent; x.iNewTable = iNewParent; x.isLeftJoin = isLeftJoin; x.pEList = pSub->pEList; x.bFlattener = 1; substSelect(&x, pParent, 0); } /* The flattened query is a compound if either the inner or the ** outer query is a compound. */ pParent->selFlags |= pSub->selFlags & SF_Compound; assert( (pSub->selFlags & SF_Distinct)==0 ); /* restriction (17b) */ ................................................................................ pNew = sqlite3ExprDup(pParse->db, pWhere, 0); unsetJoinExpr(pNew, -1); x.pParse = pParse; x.iTable = iCursor; x.iNewTable = iCursor; x.isLeftJoin = 0; x.pEList = pSubq->pEList; x.bFlattener = 0; pNew = substExpr(&x, pNew); if( pSubq->selFlags & SF_Aggregate ){ pSubq->pHaving = sqlite3ExprAnd(pParse, pSubq->pHaving, pNew); }else{ pSubq->pWhere = sqlite3ExprAnd(pParse, pSubq->pWhere, pNew); } pSubq = pSubq->pPrior; |
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*/ typedef struct SubstContext { Parse *pParse; /* The parsing context */ int iTable; /* Replace references to this table */ int iNewTable; /* New table number */ int isLeftJoin; /* Add TK_IF_NULL_ROW opcodes on each replacement */ ExprList *pEList; /* Replacement expressions */ } SubstContext; /* Forward Declarations */ static void substExprList(SubstContext*, ExprList*); static void substSelect(SubstContext*, Select*, int); /* ................................................................................ if( pNew && ExprHasProperty(pExpr,EP_FromJoin) ){ pNew->iRightJoinTable = pExpr->iRightJoinTable; ExprSetProperty(pNew, EP_FromJoin); } sqlite3ExprDelete(db, pExpr); pExpr = pNew; /* Ensure that the expression now has an implicit collation sequence, ** just as it did when it was a column of a view or sub-query. */ if( pExpr ){ if( pExpr->op!=TK_COLUMN && pExpr->op!=TK_COLLATE ){ CollSeq *pColl = sqlite3ExprCollSeq(pSubst->pParse, pExpr); pExpr = sqlite3ExprAddCollateString(pSubst->pParse, pExpr, (pColl ? pColl->zName : "BINARY") ); } ExprClearProperty(pExpr, EP_Collate); ................................................................................ if( db->mallocFailed==0 ){ SubstContext x; x.pParse = pParse; x.iTable = iParent; x.iNewTable = iNewParent; x.isLeftJoin = isLeftJoin; x.pEList = pSub->pEList; substSelect(&x, pParent, 0); } /* The flattened query is a compound if either the inner or the ** outer query is a compound. */ pParent->selFlags |= pSub->selFlags & SF_Compound; assert( (pSub->selFlags & SF_Distinct)==0 ); /* restriction (17b) */ ................................................................................ pNew = sqlite3ExprDup(pParse->db, pWhere, 0); unsetJoinExpr(pNew, -1); x.pParse = pParse; x.iTable = iCursor; x.iNewTable = iCursor; x.isLeftJoin = 0; x.pEList = pSubq->pEList; pNew = substExpr(&x, pNew); if( pSubq->selFlags & SF_Aggregate ){ pSubq->pHaving = sqlite3ExprAnd(pParse, pSubq->pHaving, pNew); }else{ pSubq->pWhere = sqlite3ExprAnd(pParse, pSubq->pWhere, pNew); } pSubq = pSubq->pPrior; |
Changes to src/test1.c.
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{ "distinct-opt", SQLITE_DistinctOpt }, { "cover-idx-scan", SQLITE_CoverIdxScan }, { "order-by-idx-join", SQLITE_OrderByIdxJoin }, { "transitive", SQLITE_Transitive }, { "omit-noop-join", SQLITE_OmitNoopJoin }, { "stat4", SQLITE_Stat4 }, { "skip-scan", SQLITE_SkipScan }, }; if( objc!=4 ){ Tcl_WrongNumArgs(interp, 1, objv, "DB OPT BOOLEAN"); return TCL_ERROR; } if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR; |
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{ "distinct-opt", SQLITE_DistinctOpt },
{ "cover-idx-scan", SQLITE_CoverIdxScan },
{ "order-by-idx-join", SQLITE_OrderByIdxJoin },
{ "transitive", SQLITE_Transitive },
{ "omit-noop-join", SQLITE_OmitNoopJoin },
{ "stat4", SQLITE_Stat4 },
{ "skip-scan", SQLITE_SkipScan },
{ "push-down", SQLITE_PushDown },
};
if( objc!=4 ){
Tcl_WrongNumArgs(interp, 1, objv, "DB OPT BOOLEAN");
return TCL_ERROR;
}
if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
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Added test/tkt-18458b1a.test.
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# 2019 September 10 # # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # This file implements regression tests for SQLite library. In particular, # that problems related to ticket [18458b1a] have been fixed. # set testdir [file dirname $argv0] source $testdir/tester.tcl set testprefix tkt-18458b1a foreach tn {1 2} { reset_db if {$tn==1} { # Disable the flattener and push-down optimizations optimization_control db query-flattener 0 optimization_control db push-down 0 } else { # Enable them optimization_control db query-flattener 1 optimization_control db push-down 1 } db cache size 0 do_execsql_test $tn.1.1 { CREATE TABLE t0(c0 COLLATE NOCASE); INSERT INTO t0(c0) VALUES ('B'); CREATE VIEW v0(c0, c1) AS SELECT DISTINCT t0.c0, 'a' FROM t0; } do_execsql_test $tn.1.2 { SELECT count(*) FROM v0 WHERE c1 >= c0; } 1 do_execsql_test $tn.1.3 { SELECT count(*) FROM v0 WHERE NOT NOT (c1 >= c0); } 1 do_execsql_test $tn.1.4 { SELECT count(*) FROM v0 WHERE ((c1 >= c0) OR 0+0); } 1 } finish_test |