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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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57
src/backend/executor/nodeResult.c
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@ -27,7 +27,7 @@
* SeqScan (emp.all)
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeResult.c,v 1.5 1997/09/08 21:43:16 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeResult.c,v 1.6 1998/02/13 03:26:52 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -58,8 +58,6 @@ ExecResult(Result *node)
TupleTableSlot *resultSlot;
Plan *outerPlan;
ExprContext *econtext;
Node *qual;
bool qualResult;
bool isDone;
ProjectionInfo *projInfo;
@ -79,26 +77,16 @@ ExecResult(Result *node)
* check tautological qualifications like (2 > 1)
* ----------------
*/
qual = node->resconstantqual;
if (qual != NULL)
if (resstate->rs_checkqual)
{
qualResult = ExecQual((List *) qual, econtext);
/* ----------------
* if we failed the constant qual, then there
* is no need to continue processing because regardless of
* what happens, the constant qual will be false..
* ----------------
*/
bool qualResult = ExecQual((List *) node->resconstantqual, econtext);
resstate->rs_checkqual = false;
if (qualResult == false)
{
resstate->rs_done = true;
return NULL;
/* ----------------
* our constant qualification succeeded so now we
* throw away the qual because we know it will always
* succeed.
* ----------------
*/
node->resconstantqual = NULL;
}
}
if (resstate->cstate.cs_TupFromTlist)
@ -204,9 +192,10 @@ ExecInitResult(Result *node, EState *estate, Plan *parent)
* ----------------
*/
resstate = makeNode(ResultState);
resstate->rs_done = 0;
resstate->rs_done = false;
resstate->rs_checkqual = (node->resconstantqual == NULL) ? false : true;
node->resstate = resstate;
/* ----------------
* Miscellanious initialization
*
@ -243,12 +232,6 @@ ExecInitResult(Result *node, EState *estate, Plan *parent)
ExecAssignResultTypeFromTL((Plan *) node, &resstate->cstate);
ExecAssignProjectionInfo((Plan *) node, &resstate->cstate);
/* ----------------
* set "are we done yet" to false
* ----------------
*/
resstate->rs_done = 0;
return TRUE;
}
@ -294,3 +277,21 @@ ExecEndResult(Result *node)
*/
ExecClearTuple(resstate->cstate.cs_ResultTupleSlot);
}
void
ExecReScanResult(Result *node, ExprContext *exprCtxt, Plan *parent)
{
ResultState *resstate = node->resstate;
resstate->rs_done = false;
resstate->cstate.cs_TupFromTlist = false;
resstate->rs_checkqual = (node->resconstantqual == NULL) ? false : true;
/*
* if chgParam of subnode is not null then plan
* will be re-scanned by first ExecProcNode.
*/
if (((Plan*) node)->lefttree->chgParam == NULL)
ExecReScan (((Plan*) node)->lefttree, exprCtxt, (Plan *) node);
}