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Re-implement LIMIT/OFFSET as a plan node type, instead of a hack in

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ExecutorRun.  This allows LIMIT to work in a view.  Also, LIMIT in a
cursor declaration will behave in a reasonable fashion, whereas before
it was overridden by the FETCH count.
This commit is contained in:
Tom Lane
2000-10-26 21:38:24 +00:00
parent c9476bafdb
commit 2f35b4efdb
26 changed files with 572 additions and 232 deletions
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23
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.98 2000/10/05 19:11:29 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.99 2000/10/26 21:36:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1651,6 +1651,27 @@ make_setop(SetOpCmd cmd, List *tlist, Plan *lefttree,
return node;
}
Limit *
make_limit(List *tlist, Plan *lefttree,
Node *limitOffset, Node *limitCount)
{
Limit *node = makeNode(Limit);
Plan *plan = &node->plan;
copy_plan_costsize(plan, lefttree);
plan->state = (EState *) NULL;
plan->targetlist = tlist;
plan->qual = NIL;
plan->lefttree = lefttree;
plan->righttree = NULL;
node->limitOffset = limitOffset;
node->limitCount = limitCount;
return node;
}
Result *
make_result(List *tlist,
Node *resconstantqual,