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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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30
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.126 2000/10/18 16:16:04 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.127 2000/10/26 21:35:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -592,6 +592,31 @@ _copySetOp(SetOp *from)
return newnode;
}
/* ----------------
* _copyLimit
* ----------------
*/
static Limit *
_copyLimit(Limit *from)
{
Limit *newnode = makeNode(Limit);
/* ----------------
* copy node superclass fields
* ----------------
*/
CopyPlanFields((Plan *) from, (Plan *) newnode);
/* ----------------
* copy remainder of node
* ----------------
*/
Node_Copy(from, newnode, limitOffset);
Node_Copy(from, newnode, limitCount);
return newnode;
}
/* ----------------
* _copyHash
* ----------------
@ -2567,6 +2592,9 @@ copyObject(void *from)
case T_SetOp:
retval = _copySetOp(from);
break;
case T_Limit:
retval = _copyLimit(from);
break;
case T_Hash:
retval = _copyHash(from);
break;