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Overview
| Comment: | Do not search using ON clause constraints of LEFT JOINs to the right of the table. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | nextgen-query-plan-exp |
| Files: | files | file ages | folders |
| SHA1: |
723f901a63313b64a9f10516711fb613 |
| User & Date: | drh 2013-05-31 20:28:28 |
Context
|
2013-05-31
| ||
| 20:43 | The NGQP might not find a solution if INDEXED BY constraints on the query are set wrong. If that is the case, print a "no query solution" error and abort before trying to use the non-existant solution. check-in: 42511a7e user: drh tags: nextgen-query-plan-exp | |
| 20:28 | Do not search using ON clause constraints of LEFT JOINs to the right of the table. check-in: 723f901a user: drh tags: nextgen-query-plan-exp | |
| 20:00 | Make sure a unique cursor number is allocated for automatic indices. check-in: 433d1aec user: drh tags: nextgen-query-plan-exp | |
Changes
Changes to src/where.c.
3992 3992 pTerm = whereScanInit(&scan, pBuilder->pWC, pSrc->iCursor, iCol, 3993 3993 opMask, pProbe); 3994 3994 savedLoop = *pNew; 3995 3995 pNew->rSetup = (double)0; 3996 3996 rLogSize = estLog(pProbe->aiRowEst[0]); 3997 3997 for(; rc==SQLITE_OK && pTerm!=0; pTerm = whereScanNext(&scan)){ 3998 3998 int nIn = 1; 3999 + if( pTerm->prereqRight & pNew->maskSelf ) continue; 3999 4000 pNew->wsFlags = savedLoop.wsFlags; 4000 4001 pNew->u.btree.nEq = savedLoop.u.btree.nEq; 4001 4002 pNew->nTerm = savedLoop.nTerm; 4002 4003 if( pNew->nTerm>=pBuilder->mxTerm ) break; /* Repeated column in index */ 4003 4004 pNew->aTerm[pNew->nTerm++] = pTerm; 4004 4005 pNew->prereq = (savedLoop.prereq | pTerm->prereqRight) & ~pNew->maskSelf; 4005 4006 if( pTerm->eOperator & WO_IN ){ ................................................................................ 4142 4143 && !pSrc->isCorrelated 4143 4144 ){ 4144 4145 /* Generate auto-index WhereLoops */ 4145 4146 WhereClause *pWC = pBuilder->pWC; 4146 4147 WhereTerm *pTerm; 4147 4148 WhereTerm *pWCEnd = pWC->a + pWC->nTerm; 4148 4149 for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){ 4150 + if( pTerm->prereqRight & pNew->maskSelf ) continue; 4149 4151 if( termCanDriveIndex(pTerm, pSrc, 0) ){ 4150 4152 pNew->u.btree.nEq = 1; 4151 4153 pNew->u.btree.pIndex = 0; 4152 4154 pNew->nTerm = 1; 4153 4155 pNew->aTerm[0] = pTerm; 4154 4156 pNew->rSetup = 20*rLogSize*pSrc->pTab->nRowEst; 4155 4157 pNew->nOut = (double)10;