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Changes to allow DELETE operations on virtual tables to use the onepass strategy under some circumstances.

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FossilOrigin-Name: e73f919fae1833c6ffb36eddbc76d9a8d9324214
This commit is contained in:
dan
2015-09-28 15:20:58 +00:00
parent 3169713be0
commit 076e0f9674
6 changed files with 44 additions and 16 deletions
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10
src/where.c
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@@ -2832,6 +2832,7 @@ static int whereLoopAddVirtual(
pIdxInfo->orderByConsumed = 0;
pIdxInfo->estimatedCost = SQLITE_BIG_DBL / (double)2;
pIdxInfo->estimatedRows = 25;
pIdxInfo->flags = 0;
rc = vtabBestIndex(pParse, pTab, pIdxInfo);
if( rc ) goto whereLoopAddVtab_exit;
pIdxCons = *(struct sqlite3_index_constraint**)&pIdxInfo->aConstraint;
@@ -2877,6 +2878,7 @@ static int whereLoopAddVirtual(
** (2) Multiple outputs from a single IN value will not merge
** together. */
pIdxInfo->orderByConsumed = 0;
pIdxInfo->flags &= ~SQLITE_INDEX_SCAN_UNIQUE;
}
}
}
@@ -2892,6 +2894,14 @@ static int whereLoopAddVirtual(
pNew->rSetup = 0;
pNew->rRun = sqlite3LogEstFromDouble(pIdxInfo->estimatedCost);
pNew->nOut = sqlite3LogEst(pIdxInfo->estimatedRows);
/* Set the WHERE_ONEROW flag if the xBestIndex() method indicated
** that the scan will visit at most one row. Clear it otherwise. */
if( pIdxInfo->flags & SQLITE_INDEX_SCAN_UNIQUE ){
pNew->wsFlags |= WHERE_ONEROW;
}else{
pNew->wsFlags &= ~WHERE_ONEROW;
}
whereLoopInsert(pBuilder, pNew);
if( pNew->u.vtab.needFree ){
sqlite3_free(pNew->u.vtab.idxStr);