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If there are already 500 or more simple SELECTs in a query, do not add more by flattening UNION ALL sub-queries into parent join queries.

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FossilOrigin-Name: 9520bed2bd87dc56543ee58123323d293e960ecd84707b77f15f41669a2c9c3d
This commit is contained in:
dan
2021-03-17 14:29:37 +00:00
parent 42470513b7
commit 51ddfef74d
3 changed files with 9 additions and 7 deletions
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src/select.c
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@@ -4039,6 +4039,7 @@ static int flattenSubquery(
if( (p->selFlags & SF_Recursive) ) return 0;
if( pSrc->nSrc>1 ){
if( pParse->nSelect>500 ) return 0;
aCsrMap = sqlite3DbMallocZero(db, pParse->nTab*sizeof(int));
}
}
@@ -4115,6 +4116,7 @@ static int flattenSubquery(
if( pNew==0 ){
p->pPrior = pPrior;
}else{
pNew->selId = ++pParse->nSelect;
if( aCsrMap && db->mallocFailed==0 ){
renumberCursors(pParse, pNew, iFrom, aCsrMap);
}