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An improved method for avoiding the use of the STAT3 samples to compute

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the estimated number of outputs when the left-most index is equality
constrained.  This check-in undoes the previous fix and applies a new one.

FossilOrigin-Name: 127a5b776d16e1e23c5b3d454f6aaea67f1ded3a
This commit is contained in:
drh
2013-08-01 17:21:26 +00:00
parent 788482c745
commit 828463375c
3 changed files with 10 additions and 9 deletions
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5
src/where.c
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@@ -4420,7 +4420,7 @@ static int whereLoopAddBtreeIndex(
pNew->nOut = saved_nOut>rDiv+10 ? saved_nOut - rDiv : 10;
}
#ifdef SQLITE_ENABLE_STAT3
if( pNew->u.btree.nEq==1 && pProbe->nSample && saved_nEq==0
if( pNew->u.btree.nEq==1 && pProbe->nSample
&& OptimizationEnabled(db, SQLITE_Stat3) ){
tRowcnt nOut = 0;
if( (pTerm->eOperator & (WO_EQ|WO_ISNULL))!=0 ){
@@ -4431,7 +4431,8 @@ static int whereLoopAddBtreeIndex(
&& !ExprHasProperty(pTerm->pExpr, EP_xIsSelect) ){
rc = whereInScanEst(pParse, pProbe, pTerm->pExpr->x.pList, &nOut);
}
if( rc==SQLITE_OK ) pNew->nOut = whereCost(nOut);
assert( nOut==0 || rc==SQLITE_OK );
if( nOut ) pNew->nOut = whereCost(nOut);
}
#endif
if( (pNew->wsFlags & (WHERE_IDX_ONLY|WHERE_IPK))==0 ){