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Add an optimization that attempts to run a subquery as a coroutine rather

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than manifesting it into a temporary table.

FossilOrigin-Name: 7af3acbbd49a2114fcdada9ec907c68ba9b053bd
This commit is contained in:
drh
2012-10-30 00:29:07 +00:00
parent 6e227bf3e0
commit 21172c4cc0
13 changed files with 104 additions and 40 deletions
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src/expr.c
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@@ -939,6 +939,7 @@ SrcList *sqlite3SrcListDup(sqlite3 *db, SrcList *p, int flags){
pNewItem->addrFillSub = pOldItem->addrFillSub;
pNewItem->regReturn = pOldItem->regReturn;
pNewItem->isCorrelated = pOldItem->isCorrelated;
pNewItem->viaCoroutine = pOldItem->viaCoroutine;
pNewItem->zIndex = sqlite3DbStrDup(db, pOldItem->zIndex);
pNewItem->notIndexed = pOldItem->notIndexed;
pNewItem->pIndex = pOldItem->pIndex;