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Fix a problem causing the count(*) optimization to be misapplied in some cases where an aggregate sub-query uses a count() expression that is aggregated against the outer query.

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FossilOrigin-Name: e30917278c0ec750b1756ddc5e32d65c55464531d6ef64d2e72a412dfe634f58
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dan
2021-11-15 14:11:23 +00:00
parent 5b001cc25d
commit 8745f8a3c3
4 changed files with 21 additions and 9 deletions
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src/select.c
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@@ -4980,6 +4980,7 @@ static Table *isSimpleCount(Select *p, AggInfo *pAggInfo){
pExpr = p->pEList->a[0].pExpr;
assert( pExpr!=0 );
if( pExpr->op!=TK_AGG_FUNCTION ) return 0;
if( pExpr->pAggInfo!=pAggInfo ) return 0;
if( (pAggInfo->aFunc[0].pFunc->funcFlags&SQLITE_FUNC_COUNT)==0 ) return 0;
assert( pAggInfo->aFunc[0].pFExpr==pExpr );
testcase( ExprHasProperty(pExpr, EP_Distinct) );