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Add a new optimizer disabling bit to disable just the UNION ALL branch of the

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query flattener.

FossilOrigin-Name: c0f9ebab5455d8541a562122d3270b95ce571c3fd870b0048dda2b036c2b66c0
This commit is contained in:
drh
2022-04-25 14:59:59 +00:00
parent 7f417569f7
commit 95fe38f2fc
4 changed files with 10 additions and 8 deletions
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src/select.c
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@@ -4325,6 +4325,7 @@ static int flattenSubquery(
if( pSrc->nSrc>1 ){
if( pParse->nSelect>500 ) return 0;
if( OptimizationDisabled(db, SQLITE_FlttnUnionAll) ) return 0;
aCsrMap = sqlite3DbMallocZero(db, ((i64)pParse->nTab+1)*sizeof(int));
if( aCsrMap ) aCsrMap[0] = pParse->nTab;
}