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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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17
src/backend/nodes/outfuncs.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.128 2000/10/05 19:11:27 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.129 2000/10/26 21:35:48 tgl Exp $
*
* NOTES
* Every (plan) node in POSTGRES has an associated "out" routine which
@ -623,6 +623,18 @@ _outSetOp(StringInfo str, SetOp *node)
(int) node->flagColIdx);
}
static void
_outLimit(StringInfo str, Limit *node)
{
appendStringInfo(str, " LIMIT ");
_outPlanInfo(str, (Plan *) node);
appendStringInfo(str, " :limitOffset ");
_outNode(str, node->limitOffset);
appendStringInfo(str, " :limitCount ");
_outNode(str, node->limitCount);
}
/*
* Hash is a subclass of Plan
*/
@ -1559,6 +1571,9 @@ _outNode(StringInfo str, void *obj)
case T_SetOp:
_outSetOp(str, obj);
break;
case T_Limit:
_outLimit(str, obj);
break;
case T_Hash:
_outHash(str, obj);
break;