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Small size reduction and performance improvement in whereScanNext().

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FossilOrigin-Name: d861ee17eb900a607de6ec3f4a5d5c24cfb834a0
This commit is contained in:
drh
2016-10-26 17:57:40 +00:00
parent d15f430111
commit 392ddeb12d
3 changed files with 19 additions and 14 deletions
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17
src/where.c
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@@ -198,11 +198,14 @@ static WhereTerm *whereScanNext(WhereScan *pScan){
WhereTerm *pTerm; /* The term being tested */
int k = pScan->k; /* Where to start scanning */
while( pScan->iEquiv<=pScan->nEquiv ){
iCur = pScan->aiCur[pScan->iEquiv-1];
assert( pScan->iEquiv<=pScan->nEquiv );
pWC = pScan->pWC;
while(1){
iColumn = pScan->aiColumn[pScan->iEquiv-1];
if( iColumn==XN_EXPR && pScan->pIdxExpr==0 ) return 0;
while( (pWC = pScan->pWC)!=0 ){
iCur = pScan->aiCur[pScan->iEquiv-1];
assert( pWC!=0 );
do{
for(pTerm=pWC->a+k; k<pWC->nTerm; k++, pTerm++){
if( pTerm->leftCursor==iCur
&& pTerm->u.leftColumn==iColumn
@@ -252,15 +255,17 @@ static WhereTerm *whereScanNext(WhereScan *pScan){
testcase( pTerm->eOperator & WO_IS );
continue;
}
pScan->pWC = pWC;
pScan->k = k+1;
return pTerm;
}
}
}
pScan->pWC = pScan->pWC->pOuter;
pWC = pWC->pOuter;
k = 0;
}
pScan->pWC = pScan->pOrigWC;
}while( pWC!=0 );
if( pScan->iEquiv>=pScan->nEquiv ) break;
pWC = pScan->pOrigWC;
k = 0;
pScan->iEquiv++;
}