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Overview
Comment: | Modify the sqlite3SelectDup() routine to avoid recursing on Select.pPrior. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | recursive-selectdup |
Files: | files | file ages | folders |
SHA1: |
a7674ead5be986c66f7d61d598adc7e5 |
User & Date: | dan 2017-02-03 14:44:52.406 |
Context
2017-02-03
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19:16 | Avoid a performance problem when very large "VALUES(..), (..), (..)" terms are used in queries. (Closed-Leaf check-in: f5306ad681 user: dan tags: recursive-selectdup) | |
14:44 | Modify the sqlite3SelectDup() routine to avoid recursing on Select.pPrior. (check-in: a7674ead5b user: dan tags: recursive-selectdup) | |
2017-02-02
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20:32 | Ensure that all cursors have their positions saved prior to rolling back a savepoint. (check-in: 8e03a8e95f user: drh tags: trunk) | |
Changes
Changes to src/expr.c.
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1414 1415 1416 1417 1418 1419 1420 | struct IdList_item *pNewItem = &pNew->a[i]; struct IdList_item *pOldItem = &p->a[i]; pNewItem->zName = sqlite3DbStrDup(db, pOldItem->zName); pNewItem->idx = pOldItem->idx; } return pNew; } | | > > > | > | | | | | | | | | | < | | | | | | | | | | | | > > > > > | | 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 | struct IdList_item *pNewItem = &pNew->a[i]; struct IdList_item *pOldItem = &p->a[i]; pNewItem->zName = sqlite3DbStrDup(db, pOldItem->zName); pNewItem->idx = pOldItem->idx; } return pNew; } Select *sqlite3SelectDup(sqlite3 *db, Select *pDup, int flags){ Select *pRet = 0; Select *pNext = 0; Select **pp = &pRet; Select *p; assert( db!=0 ); for(p=pDup; p; p=p->pPrior){ Select *pNew = sqlite3DbMallocRawNN(db, sizeof(*p) ); if( pNew==0 ) break; pNew->pEList = sqlite3ExprListDup(db, p->pEList, flags); pNew->pSrc = sqlite3SrcListDup(db, p->pSrc, flags); pNew->pWhere = sqlite3ExprDup(db, p->pWhere, flags); pNew->pGroupBy = sqlite3ExprListDup(db, p->pGroupBy, flags); pNew->pHaving = sqlite3ExprDup(db, p->pHaving, flags); pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, flags); pNew->op = p->op; pNew->pNext = pNext; pNew->pPrior = 0; pNew->pLimit = sqlite3ExprDup(db, p->pLimit, flags); pNew->pOffset = sqlite3ExprDup(db, p->pOffset, flags); pNew->iLimit = 0; pNew->iOffset = 0; pNew->selFlags = p->selFlags & ~SF_UsesEphemeral; pNew->addrOpenEphm[0] = -1; pNew->addrOpenEphm[1] = -1; pNew->nSelectRow = p->nSelectRow; pNew->pWith = withDup(db, p->pWith); sqlite3SelectSetName(pNew, p->zSelName); *pp = pNew; pp = &pNew->pPrior; pNext = pNew; } return pRet; } #else Select *sqlite3SelectDup(sqlite3 *db, Select *p, int flags){ assert( p==0 ); return 0; } #endif |
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