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Disable the flattening optimization if the sub-query is a recursive CTE.

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FossilOrigin-Name: 9472f6d820a7fb233936d9b8f7a39c9d4c4d6d73
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dan
2014-01-15 14:17:31 +00:00
parent f9db522fee
commit bfe31e7f80
6 changed files with 68 additions and 14 deletions
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3
src/select.c
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@@ -2844,6 +2844,8 @@ static void substSelect(
**
** Flattening is only attempted if all of the following are true:
**
** (0) The subquery is not a recursive CTE.
**
** (1) The subquery and the outer query do not both use aggregates.
**
** (2) The subquery is not an aggregate or the outer query is not a join.
@@ -2968,6 +2970,7 @@ static int flattenSubquery(
iParent = pSubitem->iCursor;
pSub = pSubitem->pSelect;
assert( pSub!=0 );
if( pSub->pRecurse ) return 0; /* Restriction (0) */
if( isAgg && subqueryIsAgg ) return 0; /* Restriction (1) */
if( subqueryIsAgg && pSrc->nSrc>1 ) return 0; /* Restriction (2) */
pSubSrc = pSub->pSrc;