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Do not apply the push-down optimization to CTE subqueries that will be

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reused in other contexts in where the same optimization is unlikely to
be valid.  Fix for the bug reported by
[forum:/forumpost/d496c3d29bc93736|forum post d496c3d29bc93736].

FossilOrigin-Name: a7ce29a6ef2e0362bbc9b23719d936dce07209b2651153c774682f599bbd888e
This commit is contained in:
drh
2021-08-11 13:48:56 +00:00
parent 834c688171
commit df67ec08ff
4 changed files with 20 additions and 9 deletions
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3
src/select.c
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@@ -6583,7 +6583,8 @@ int sqlite3Select(
** inside the subquery. This can help the subquery to run more efficiently.
*/
if( OptimizationEnabled(db, SQLITE_PushDown)
&& (pItem->fg.isCte==0 || pItem->u2.pCteUse->eM10d!=M10d_Yes)
&& (pItem->fg.isCte==0
|| (pItem->u2.pCteUse->eM10d!=M10d_Yes && pItem->u2.pCteUse->nUse<2))
&& pushDownWhereTerms(pParse, pSub, p->pWhere, pItem->iCursor,
(pItem->fg.jointype & JT_OUTER)!=0)
){