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Support for subselects.

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ExecReScan for nodeAgg, nodeHash, nodeHashjoin, nodeNestloop and nodeResult.
Fixed ExecReScan for nodeMaterial.
Get rid of #ifdef INDEXSCAN_PATCH.
Get rid of ExecMarkPos and ExecRestrPos in nodeNestloop.
This commit is contained in:
Vadim B. Mikheev
1998-02-13 03:26:53 +00:00
parent 13637df458
commit 1a105cefbd
15 changed files with 677 additions and 153 deletions
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48
src/backend/executor/nodeNestloop.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeNestloop.c,v 1.7 1997/09/08 21:43:16 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeNestloop.c,v 1.8 1998/02/13 03:26:51 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -86,7 +86,8 @@ ExecNestLoop(NestLoop *node, Plan *parent)
*/
econtext = nlstate->jstate.cs_ExprContext;
/* ---------------- * get the current outer tuple
/* ----------------
* get the current outer tuple
* ----------------
*/
outerTupleSlot = nlstate->jstate.cs_OuterTupleSlot;
@ -118,16 +119,9 @@ ExecNestLoop(NestLoop *node, Plan *parent)
*/
needNewOuterTuple = false;
/* ----------------
* If outer tuple is not null then that means
* we are in the middle of a scan and we should
* restore our previously saved scan position.
* ----------------
*/
if (!TupIsNull(outerTupleSlot))
{
ENL1_printf("have outer tuple, restoring outer plan");
ExecRestrPos(outerPlan);
ENL1_printf("have outer tuple, deal with it");
}
else
{
@ -179,14 +173,7 @@ ExecNestLoop(NestLoop *node, Plan *parent)
return NULL;
}
/* ----------------
* we have a new outer tuple so we mark our position
* in the outer scan and save the outer tuple in the
* NestLoop state
* ----------------
*/
ENL1_printf("saving new outer tuple information");
ExecMarkPos(outerPlan);
nlstate->jstate.cs_OuterTupleSlot = outerTupleSlot;
/* ----------------
@ -385,3 +372,30 @@ ExecEndNestLoop(NestLoop *node)
NL1_printf("ExecEndNestLoop: %s\n",
"node processing ended");
}
/* ----------------------------------------------------------------
* ExecReScanNestLoop
* ----------------------------------------------------------------
*/
void
ExecReScanNestLoop(NestLoop *node, ExprContext *exprCtxt, Plan *parent)
{
NestLoopState *nlstate = node->nlstate;
Plan *outerPlan = outerPlan((Plan*) node);
/*
* If outerPlan->chgParam is not null then plan will be
* automatically re-scanned by first ExecProcNode.
* innerPlan is re-scanned for each new outer tuple and MUST NOT
* be re-scanned from here or you'll get troubles from inner
* index scans when outer Vars are used as run-time keys...
*/
if (outerPlan->chgParam == NULL)
ExecReScan (outerPlan, exprCtxt, (Plan *) node);
/* let outerPlan to free its result typle ... */
nlstate->jstate.cs_OuterTupleSlot = NULL;
nlstate->jstate.cs_TupFromTlist = false;
return;
}