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Overview
Comment: | Simplify the query flattener so that it does not duplicate the WHERE clause of subquery that is being incorporated into the outer query - copies it directly. This is more efficient. And it also fixes the specific test case show for ticket [f09fcd17810f65f71789525] but it does not resolve the more general problem that sqlite3ExprDup() does not correctly duplicate expressions that contain subqueries with window functions. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | ticket-f09fcd17810f |
Files: | files | file ages | folders |
SHA3-256: |
f1b18d44ff855573542c1947a42d4025 |
User & Date: | drh 2018-12-06 19:15:36.453 |
Context
2018-12-06
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19:56 | New test case that still hits an assertion fault, just to prove that the previous checkin merely made the problem more obscure and did not completely fix it. (check-in: a9a3b53264 user: drh tags: ticket-f09fcd17810f) | |
19:15 | Simplify the query flattener so that it does not duplicate the WHERE clause of subquery that is being incorporated into the outer query - copies it directly. This is more efficient. And it also fixes the specific test case show for ticket [f09fcd17810f65f71789525] but it does not resolve the more general problem that sqlite3ExprDup() does not correctly duplicate expressions that contain subqueries with window functions. (check-in: f1b18d44ff user: drh tags: ticket-f09fcd17810f) | |
17:06 | When masking bits off of sqlite3.flags, make sure the mask is 64 bits in size so as not to accidentally mask of high-order bits. (check-in: 53d3b169d8 user: drh tags: trunk) | |
Changes
Changes to src/select.c.
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3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 | if( pSubst->isLeftJoin && pCopy->op!=TK_COLUMN ){ memset(&ifNullRow, 0, sizeof(ifNullRow)); ifNullRow.op = TK_IF_NULL_ROW; ifNullRow.pLeft = pCopy; ifNullRow.iTable = pSubst->iNewTable; pCopy = &ifNullRow; } pNew = sqlite3ExprDup(db, pCopy, 0); if( pNew && pSubst->isLeftJoin ){ ExprSetProperty(pNew, EP_CanBeNull); } if( pNew && ExprHasProperty(pExpr,EP_FromJoin) ){ pNew->iRightJoinTable = pExpr->iRightJoinTable; ExprSetProperty(pNew, EP_FromJoin); | > | 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 | if( pSubst->isLeftJoin && pCopy->op!=TK_COLUMN ){ memset(&ifNullRow, 0, sizeof(ifNullRow)); ifNullRow.op = TK_IF_NULL_ROW; ifNullRow.pLeft = pCopy; ifNullRow.iTable = pSubst->iNewTable; pCopy = &ifNullRow; } testcase( ExprHasProperty(pCopy, EP_Subquery) ); pNew = sqlite3ExprDup(db, pCopy, 0); if( pNew && pSubst->isLeftJoin ){ ExprSetProperty(pNew, EP_CanBeNull); } if( pNew && ExprHasProperty(pExpr,EP_FromJoin) ){ pNew->iRightJoinTable = pExpr->iRightJoinTable; ExprSetProperty(pNew, EP_FromJoin); |
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4021 4022 4023 4024 4025 4026 4027 | for(i=0; i<pOrderBy->nExpr; i++){ pOrderBy->a[i].u.x.iOrderByCol = 0; } assert( pParent->pOrderBy==0 ); pParent->pOrderBy = pOrderBy; pSub->pOrderBy = 0; } | > | | 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 | for(i=0; i<pOrderBy->nExpr; i++){ pOrderBy->a[i].u.x.iOrderByCol = 0; } assert( pParent->pOrderBy==0 ); pParent->pOrderBy = pOrderBy; pSub->pOrderBy = 0; } pWhere = pSub->pWhere; pSub->pWhere = 0; if( isLeftJoin>0 ){ setJoinExpr(pWhere, iNewParent); } pParent->pWhere = sqlite3ExprAnd(db, pWhere, pParent->pWhere); if( db->mallocFailed==0 ){ SubstContext x; x.pParse = pParse; |
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Changes to test/window1.test.
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589 590 591 592 593 594 595 596 597 | do_execsql_test 13.5 { SELECT a, rank() OVER(ORDER BY b) FROM t1 INTERSECT SELECT a, rank() OVER(ORDER BY b DESC) FROM t1; } { } finish_test | > > > > > > > > > > > > > | 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 | do_execsql_test 13.5 { SELECT a, rank() OVER(ORDER BY b) FROM t1 INTERSECT SELECT a, rank() OVER(ORDER BY b DESC) FROM t1; } { } # 2018-12-06 # https://www.sqlite.org/src/info/f09fcd17810f65f7 # Assertion fault when window functions are used # sqlite3 db :memory: do_execsql_test 14.0 { SELECT * FROM( SELECT * FROM (SELECT 1 AS c) WHERE c IN ( SELECT (row_number() OVER()) FROM (VALUES (0)) ) ); } {1} finish_test |