Support for subselects.

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.

15 files changed, 677 insertions, 153 deletions

diff --git a/src/backend/executor/Makefile b/src/backend/executor/Makefile
index b1ebb0b2155..9ae3cfc3518 100644
--- a/src/backend/executor/Makefile
+++ b/src/backend/executor/Makefile
@@ -4,7 +4,7 @@
 #    Makefile for executor
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/backend/executor/Makefile,v 1.5 1997/12/20 00:23:37 scrappy Exp $
+#    $Header: /cvsroot/pgsql/src/backend/executor/Makefile,v 1.6 1998/02/13 03:26:35 vadim Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -20,7 +20,7 @@ OBJS = execAmi.o execFlatten.o execJunk.o execMain.o \
        execUtils.o functions.o nodeAppend.o nodeAgg.o nodeHash.o \
        nodeHashjoin.o nodeIndexscan.o nodeMaterial.o nodeMergejoin.o \
        nodeNestloop.o nodeResult.o nodeSeqscan.o nodeSort.o \
-       nodeUnique.o nodeTee.o nodeGroup.o spi.o
+       nodeUnique.o nodeTee.o nodeGroup.o spi.o nodeSubplan.o
 
 all: SUBSYS.o
 
diff --git a/src/backend/executor/execAmi.c b/src/backend/executor/execAmi.c
index 2349f32411e..759d17be4fd 100644
--- a/src/backend/executor/execAmi.c
+++ b/src/backend/executor/execAmi.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execAmi.c,v 1.16 1998/01/16 23:19:47 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execAmi.c,v 1.17 1998/02/13 03:26:36 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -37,6 +37,13 @@
 #include "executor/nodeIndexscan.h"
 #include "executor/nodeSort.h"
 #include "executor/nodeTee.h"
+#include "executor/nodeMaterial.h"
+#include "executor/nodeNestloop.h"
+#include "executor/nodeHashjoin.h"
+#include "executor/nodeHash.h"
+#include "executor/nodeAgg.h"
+#include "executor/nodeResult.h"
+#include "executor/nodeSubplan.h"
 #include "executor/execdebug.h"
 #include "optimizer/internal.h" /* for _TEMP_RELATION_ID_ */
 #include "access/genam.h"
@@ -287,35 +294,82 @@ ExecCloseR(Plan *node)
 void
 ExecReScan(Plan *node, ExprContext *exprCtxt, Plan *parent)
 {
+
+	if ( node->chgParam != NULL )	/* Wow! */
+	{
+		List   *lst;
+		
+		foreach (lst, node->initPlan)
+		{
+			Plan   *splan = ((SubPlan*) lfirst (lst))->plan;
+			if ( splan->extParam != NULL )	/* don't care about child locParam */
+				SetChangedParamList (splan, node->chgParam);
+			if ( splan->chgParam != NULL )
+				ExecReScanSetParamPlan ((SubPlan*) lfirst (lst), node);
+		}
+		foreach (lst, node->subPlan)
+		{
+			Plan   *splan = ((SubPlan*) lfirst (lst))->plan;
+			if ( splan->extParam != NULL )
+				SetChangedParamList (splan, node->chgParam);
+		}
+		/* Well. Now set chgParam for left/right trees. */
+		if ( node->lefttree != NULL )
+			SetChangedParamList (node->lefttree, node->chgParam);
+		if ( node->righttree != NULL )
+			SetChangedParamList (node->righttree, node->chgParam);
+	}
+
 	switch (nodeTag(node))
 	{
-			case T_SeqScan:
+		case T_SeqScan:
 			ExecSeqReScan((SeqScan *) node, exprCtxt, parent);
-			return;
+			break;
 
 		case T_IndexScan:
 			ExecIndexReScan((IndexScan *) node, exprCtxt, parent);
-			return;
+			break;
 
 		case T_Material:
+			ExecMaterialReScan((Material*) node, exprCtxt, parent);
+			break;
 
-			/*
-			 * the first call to ExecReScan should have no effect because
-			 * everything is initialized properly already.	the following
-			 * calls will be handled by ExecSeqReScan() because the nodes
-			 * below the Material node have already been materialized into
-			 * a temp relation.
-			 */
-			return;
+		case T_NestLoop:
+			ExecReScanNestLoop((NestLoop*) node, exprCtxt, parent);
+			break;
+
+		case T_HashJoin:
+			ExecReScanHashJoin((HashJoin*) node, exprCtxt, parent);
+			break;
+
+		case T_Hash:
+			ExecReScanHash((Hash*) node, exprCtxt, parent);
+			break;
+
+		case T_Agg:
+			ExecReScanAgg((Agg*) node, exprCtxt, parent);
+			break;
 
+		case T_Result:
+			ExecReScanResult((Result*) node, exprCtxt, parent);
+			break;
+
+/* 
+ * Tee is never used
 		case T_Tee:
 			ExecTeeReScan((Tee *) node, exprCtxt, parent);
 			break;
-
+ */
 		default:
-			elog(ERROR, "ExecReScan: not a seqscan or indexscan node.");
+			elog(ERROR, "ExecReScan: node type %u not supported", nodeTag(node));
 			return;
 	}
+	
+	if ( node->chgParam != NULL )
+	{
+		freeList (node->chgParam);
+		node->chgParam = NULL;
+	}
 }
 
 /* ----------------------------------------------------------------
@@ -352,7 +406,7 @@ ExecMarkPos(Plan *node)
 {
 	switch (nodeTag(node))
 	{
-			case T_SeqScan:
+		case T_SeqScan:
 			ExecSeqMarkPos((SeqScan *) node);
 			break;
 
@@ -365,7 +419,7 @@ ExecMarkPos(Plan *node)
 			break;
 
 		default:
-			/* elog(DEBUG, "ExecMarkPos: unsupported node type"); */
+			elog(DEBUG, "ExecMarkPos: node type %u not supported", nodeTag(node));
 			break;
 	}
 	return;
@@ -382,7 +436,7 @@ ExecRestrPos(Plan *node)
 {
 	switch (nodeTag(node))
 	{
-			case T_SeqScan:
+		case T_SeqScan:
 			ExecSeqRestrPos((SeqScan *) node);
 			return;
 
@@ -395,7 +449,7 @@ ExecRestrPos(Plan *node)
 			return;
 
 		default:
-			/* elog(DEBUG, "ExecRestrPos: node type not supported"); */
+			elog(DEBUG, "ExecRestrPos: node type %u not supported", nodeTag(node));
 			return;
 	}
 }
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index c4bea118db6..8702ede2483 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -26,7 +26,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.41 1998/02/10 04:00:45 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.42 1998/02/13 03:26:38 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -110,7 +110,14 @@ ExecutorStart(QueryDesc *queryDesc, EState *estate)
 
 	/* sanity checks */
 	Assert(queryDesc != NULL);
-
+	
+	if (queryDesc->plantree->nParamExec > 0)
+	{
+		estate->es_param_exec_vals = (ParamExecData*) 
+			palloc (queryDesc->plantree->nParamExec * sizeof (ParamExecData));
+		memset (estate->es_param_exec_vals, 0 , queryDesc->plantree->nParamExec * sizeof (ParamExecData));
+	}
+	
 	result = InitPlan(queryDesc->operation,
 					  queryDesc->parsetree,
 					  queryDesc->plantree,
@@ -177,31 +184,6 @@ ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count)
 	estate->es_processed = 0;
 	estate->es_lastoid = InvalidOid;
 
-#if 0
-
-	/*
-	 * It doesn't work in common case (i.g. if function has a aggregate).
-	 * Now we store parameter values before ExecutorStart. - vadim
-	 * 01/22/97
-	 */
-#ifdef INDEXSCAN_PATCH
-
-	/*
-	 * If the plan is an index scan and some of the scan key are function
-	 * arguments rescan the indices after the parameter values have been
-	 * stored in the execution state.  DZ - 27-8-1996
-	 */
-	if ((nodeTag(plan) == T_IndexScan) &&
-		(((IndexScan *) plan)->indxstate->iss_RuntimeKeyInfo != NULL))
-	{
-		ExprContext *econtext;
-
-		econtext = ((IndexScan *) plan)->scan.scanstate->cstate.cs_ExprContext;
-		ExecIndexReScan((IndexScan *) plan, econtext, plan);
-	}
-#endif
-#endif
-
 	switch (feature)
 	{
 
@@ -1246,7 +1228,8 @@ ExecAttrDefault(Relation rel, HeapTuple tuple)
 	econtext->ecxt_outertuple = NULL;	/* outer tuple slot */
 	econtext->ecxt_relation = NULL;		/* relation */
 	econtext->ecxt_relid = 0;	/* relid */
-	econtext->ecxt_param_list_info = NULL;		/* param list info */
+	econtext->ecxt_param_list_info = NULL;	/* param list info */
+	econtext->ecxt_param_exec_vals = NULL;	/* exec param values */
 	econtext->ecxt_range_table = NULL;	/* range table */
 	for (i = 0; i < ndef; i++)
 	{
@@ -1322,6 +1305,7 @@ ExecRelCheck(Relation rel, HeapTuple tuple)
 	econtext->ecxt_relation = rel;		/* relation */
 	econtext->ecxt_relid = 0;	/* relid */
 	econtext->ecxt_param_list_info = NULL;		/* param list info */
+	econtext->ecxt_param_exec_vals = NULL;		/* exec param values */
 	econtext->ecxt_range_table = rtlist;		/* range table */
 
 	for (i = 0; i < ncheck; i++)
diff --git a/src/backend/executor/execProcnode.c b/src/backend/executor/execProcnode.c
index a2bd3e6ca6d..017fdfba4d1 100644
--- a/src/backend/executor/execProcnode.c
+++ b/src/backend/executor/execProcnode.c
@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execProcnode.c,v 1.7 1998/01/07 21:02:44 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execProcnode.c,v 1.8 1998/02/13 03:26:40 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -89,6 +89,7 @@
 #include "executor/nodeHash.h"
 #include "executor/nodeHashjoin.h"
 #include "executor/nodeTee.h"
+#include "executor/nodeSubplan.h"
 
 /* ------------------------------------------------------------------------
  *		ExecInitNode
@@ -106,6 +107,7 @@ bool
 ExecInitNode(Plan *node, EState *estate, Plan *parent)
 {
 	bool		result;
+	List	   *subp;
 
 	/* ----------------
 	 *	do nothing when we get to the end
@@ -114,7 +116,14 @@ ExecInitNode(Plan *node, EState *estate, Plan *parent)
 	 */
 	if (node == NULL)
 		return FALSE;
-
+	
+	foreach (subp, node->initPlan)
+	{
+		result = ExecInitSubPlan ((SubPlan*) lfirst (subp), estate, node);
+		if ( result == FALSE )
+			return (FALSE);
+	}
+	
 	switch (nodeTag(node))
 	{
 			/* ----------------
@@ -190,10 +199,19 @@ ExecInitNode(Plan *node, EState *estate, Plan *parent)
 			break;
 
 		default:
-			elog(DEBUG, "ExecInitNode: node not yet supported: %d",
-				 nodeTag(node));
+			elog(ERROR, "ExecInitNode: node %d unsupported", nodeTag(node));
 			result = FALSE;
 	}
+	
+	if ( result != FALSE )
+	{
+		foreach (subp, node->subPlan)
+		{
+			result = ExecInitSubPlan ((SubPlan*) lfirst (subp), estate, node);
+			if ( result == FALSE )
+				return (FALSE);
+		}
+	}
 
 	return result;
 }
@@ -217,7 +235,10 @@ ExecProcNode(Plan *node, Plan *parent)
 	 */
 	if (node == NULL)
 		return NULL;
-
+	
+	if ( node->chgParam != NULL )				/* something changed */
+		ExecReScan (node, NULL, parent);		/* let ReScan handle this */
+	
 	switch (nodeTag(node))
 	{
 			/* ----------------
@@ -293,9 +314,8 @@ ExecProcNode(Plan *node, Plan *parent)
 			break;
 
 		default:
-			elog(DEBUG, "ExecProcNode: node not yet supported: %d",
-				 nodeTag(node));
-			result = FALSE;
+			elog(ERROR, "ExecProcNode: node %d unsupported", nodeTag(node));
+			result = NULL;
 	}
 
 	return result;
@@ -389,6 +409,8 @@ ExecCountSlotsNode(Plan *node)
 void
 ExecEndNode(Plan *node, Plan *parent)
 {
+	List	   *subp;
+	
 	/* ----------------
 	 *	do nothing when we get to the end
 	 *	of a leaf on tree.
@@ -396,6 +418,20 @@ ExecEndNode(Plan *node, Plan *parent)
 	 */
 	if (node == NULL)
 		return;
+	
+	foreach (subp, node->initPlan)
+	{
+		ExecEndSubPlan ((SubPlan*) lfirst (subp));
+	}
+	foreach (subp, node->subPlan)
+	{
+		ExecEndSubPlan ((SubPlan*) lfirst (subp));
+	}
+	if ( node->chgParam != NULL )
+	{
+		freeList (node->chgParam);
+		node->chgParam = NULL;
+	}
 
 	switch (nodeTag(node))
 	{
@@ -476,8 +512,7 @@ ExecEndNode(Plan *node, Plan *parent)
 			break;
 
 		default:
-			elog(DEBUG, "ExecEndNode: node not yet supported",
-				 nodeTag(node));
+			elog(ERROR, "ExecEndNode: node %d unsupported", nodeTag(node));
 			break;
 	}
 }
diff --git a/src/backend/executor/execQual.c b/src/backend/executor/execQual.c
index 98a8042cc3d..78c91539c7f 100644
--- a/src/backend/executor/execQual.c
+++ b/src/backend/executor/execQual.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.24 1998/01/31 04:38:27 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.25 1998/02/13 03:26:42 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -46,6 +46,7 @@
 #include "executor/execdebug.h"
 #include "executor/execFlatten.h"
 #include "executor/functions.h"
+#include "executor/nodeSubplan.h"
 #include "access/heapam.h"
 #include "utils/memutils.h"
 #include "utils/builtins.h"
@@ -374,14 +375,23 @@ ExecEvalParam(Param *expression, ExprContext *econtext, bool *isNull)
 {
 
 	char	   *thisParameterName;
-	int			thisParameterKind;
-	AttrNumber	thisParameterId;
+	int			thisParameterKind = expression->paramkind;
+	AttrNumber	thisParameterId = expression->paramid;
 	int			matchFound;
 	ParamListInfo paramList;
-
+	
+	if ( thisParameterKind == PARAM_EXEC )
+	{
+		ParamExecData   *prm = &(econtext->ecxt_param_exec_vals[thisParameterId]);
+		
+		if ( prm->execPlan != NULL )
+			ExecSetParamPlan (prm->execPlan);
+		Assert (prm->execPlan == NULL);
+		*isNull = prm->isnull;
+		return (prm->value);
+	}
+	
 	thisParameterName = expression->paramname;
-	thisParameterKind = expression->paramkind;
-	thisParameterId = expression->paramid;
 	paramList = econtext->ecxt_param_list_info;
 
 	*isNull = false;
@@ -1227,14 +1237,17 @@ ExecEvalExpr(Node *expression,
 					case NOT_EXPR:
 						retDatum = (Datum) ExecEvalNot(expr, econtext, isNull);
 						break;
+					case SUBPLAN_EXPR:
+						retDatum = (Datum) ExecSubPlan((SubPlan*) expr->oper, expr->args, econtext);
+						break;
 					default:
-						elog(ERROR, "ExecEvalExpr: unknown expression type");
+						elog(ERROR, "ExecEvalExpr: unknown expression type %d", expr->opType);
 						break;
 				}
 				break;
 			}
 		default:
-			elog(ERROR, "ExecEvalExpr: unknown expression type");
+			elog(ERROR, "ExecEvalExpr: unknown expression type %d", nodeTag(expression));
 			break;
 	}
 
diff --git a/src/backend/executor/execUtils.c b/src/backend/executor/execUtils.c
index e02205828ae..69ef6671075 100644
--- a/src/backend/executor/execUtils.c
+++ b/src/backend/executor/execUtils.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.28 1998/02/10 04:00:52 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.29 1998/02/13 03:26:43 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -180,11 +180,6 @@ void
 ExecAssignExprContext(EState *estate, CommonState *commonstate)
 {
 	ExprContext *econtext;
-	ParamListInfo paraminfo;
-	List	   *rangeTable;
-
-	paraminfo = estate->es_param_list_info;
-	rangeTable = estate->es_range_table;
 
 	econtext = makeNode(ExprContext);
 	econtext->ecxt_scantuple = NULL;	/* scan tuple slot */
@@ -192,8 +187,9 @@ ExecAssignExprContext(EState *estate, CommonState *commonstate)
 	econtext->ecxt_outertuple = NULL;	/* outer tuple slot */
 	econtext->ecxt_relation = NULL;		/* relation */
 	econtext->ecxt_relid = 0;	/* relid */
-	econtext->ecxt_param_list_info = paraminfo; /* param list info */
-	econtext->ecxt_range_table = rangeTable;	/* range table */
+	econtext->ecxt_param_list_info = estate->es_param_list_info;
+	econtext->ecxt_param_exec_vals = estate->es_param_exec_vals;
+	econtext->ecxt_range_table = estate->es_range_table;	/* range table */
 
 	commonstate->cs_ExprContext = econtext;
 }
@@ -1179,3 +1175,25 @@ ExecInsertIndexTuples(TupleTableSlot *slot,
 	if (econtext != NULL)
 		pfree(econtext);
 }
+
+void 
+SetChangedParamList (Plan *node, List *newchg)
+{
+	List   *nl;
+	
+	foreach (nl, newchg)
+	{
+		int	paramId = lfirsti(nl);
+		
+		/* if this node doesn't depend on a param ... */
+		if ( !intMember (paramId, node->extParam) &&
+				!intMember (paramId, node->locParam) )
+			continue;
+		/* if this param is already in list of changed ones ... */
+		if ( intMember (paramId, node->chgParam) )
+			continue;
+		/* else - add this param to the list */
+		node->chgParam = lappendi (node->chgParam, paramId);
+	}
+
+}
diff --git a/src/backend/executor/functions.c b/src/backend/executor/functions.c
index 2cd62e39c0c..f6e034d9881 100644
--- a/src/backend/executor/functions.c
+++ b/src/backend/executor/functions.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/functions.c,v 1.15 1998/01/31 04:38:28 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/functions.c,v 1.16 1998/02/13 03:26:44 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -303,8 +303,6 @@ postquel_execute(execution_state *es,
 	TupleTableSlot *slot;
 	Datum		value;
 
-#ifdef INDEXSCAN_PATCH
-
 	/*
 	 * It's more right place to do it (before
 	 * postquel_start->ExecutorStart). Now
@@ -313,17 +311,12 @@ postquel_execute(execution_state *es,
 	 */
 	if (fcache->nargs > 0)
 		postquel_sub_params(es, fcache->nargs, args, fcache->nullVect);
-#endif
 
 	if (es->status == F_EXEC_START)
 	{
 		postquel_start(es);
 		es->status = F_EXEC_RUN;
 	}
-#ifndef INDEXSCAN_PATCH
-	if (fcache->nargs > 0)
-		postquel_sub_params(es, fcache->nargs, args, fcache->nullVect);
-#endif
 
 	slot = postquel_getnext(es);
 
diff --git a/src/backend/executor/nodeAgg.c b/src/backend/executor/nodeAgg.c
index 444a5bc9db6..9778e365a58 100644
--- a/src/backend/executor/nodeAgg.c
+++ b/src/backend/executor/nodeAgg.c
@@ -676,3 +676,21 @@ aggGetAttr(TupleTableSlot *slot,
 
 	return result;
 }
+
+void
+ExecReScanAgg(Agg *node, ExprContext *exprCtxt, Plan *parent)
+{
+	AggState	   *aggstate = node->aggstate;
+	ExprContext	   *econtext = aggstate->csstate.cstate.cs_ExprContext;
+
+	aggstate->agg_done = FALSE;
+	MemSet(econtext->ecxt_values, 0, sizeof(Datum) * length(node->aggs));
+	MemSet(econtext->ecxt_nulls, 0, length(node->aggs));
+	/* 
+	 * 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);
+	
+}
diff --git a/src/backend/executor/nodeHash.c b/src/backend/executor/nodeHash.c
index 031d718250d..5ebf508c0c0 100644
--- a/src/backend/executor/nodeHash.c
+++ b/src/backend/executor/nodeHash.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeHash.c,v 1.18 1998/02/11 19:10:28 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeHash.c,v 1.19 1998/02/13 03:26:46 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -890,3 +890,23 @@ mk_hj_temp(char *tempname)
 	sprintf(tempname, "HJ%d.%d", (int) MyProcPid, hjtmpcnt);
 	hjtmpcnt = (hjtmpcnt + 1) % 1000;
 }
+
+void
+ExecReScanHash(Hash *node, ExprContext *exprCtxt, Plan *parent)
+{
+	HashState  *hashstate = node->hashstate;
+
+	if (hashstate->hashBatches != NULL)
+	{
+		pfree(hashstate->hashBatches);
+		hashstate->hashBatches = NULL;
+	}
+	
+	/* 
+	 * 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);
+	
+}
diff --git a/src/backend/executor/nodeHashjoin.c b/src/backend/executor/nodeHashjoin.c
index c5fa8a092de..21132410d45 100644
--- a/src/backend/executor/nodeHashjoin.c
+++ b/src/backend/executor/nodeHashjoin.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeHashjoin.c,v 1.9 1998/01/13 04:03:58 scrappy Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeHashjoin.c,v 1.10 1998/02/13 03:26:47 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -154,6 +154,9 @@ ExecHashJoin(HashJoin *node)
 		curbatch = 0;
 		node->hashdone = true;
 	}
+	else if (hashtable == NULL)
+		return (NULL);
+	
 	nbatch = hashtable->nbatch;
 	outerbatches = hjstate->hj_OuterBatches;
 	if (nbatch > 0 && outerbatches == NULL)
@@ -209,14 +212,12 @@ ExecHashJoin(HashJoin *node)
 
 		while (curbatch <= nbatch && TupIsNull(outerTupleSlot))
 		{
-
 			/*
 			 * if the current batch runs out, switch to new batch
 			 */
 			curbatch = ExecHashJoinNewBatch(hjstate);
 			if (curbatch > nbatch)
 			{
-
 				/*
 				 * when the last batch runs out, clean up
 				 */
@@ -349,7 +350,6 @@ ExecHashJoin(HashJoin *node)
 			curbatch = ExecHashJoinNewBatch(hjstate);
 			if (curbatch > nbatch)
 			{
-
 				/*
 				 * when the last batch runs out, clean up
 				 */
@@ -841,3 +841,45 @@ ExecHashJoinSaveTuple(HeapTuple heapTuple,
 
 	return position;
 }
+
+void
+ExecReScanHashJoin(HashJoin *node, ExprContext *exprCtxt, Plan *parent)
+{
+	HashJoinState  *hjstate = node->hashjoinstate;
+
+	if (!node->hashdone)
+		return;
+	
+	node->hashdone = false;
+	
+	/* 
+	 * Unfortunately, currently we have to destroy hashtable 
+	 * in all cases...
+	 */
+	if (hjstate->hj_HashTable)
+	{
+		ExecHashTableDestroy(hjstate->hj_HashTable);
+		hjstate->hj_HashTable = NULL;
+	}
+	hjstate->hj_CurBucket = (HashBucket) NULL;
+	hjstate->hj_CurTuple = (HeapTuple) NULL;
+	hjstate->hj_CurOTuple = (OverflowTuple) NULL;
+	hjstate->hj_InnerHashKey = (Var *) NULL;
+	hjstate->hj_OuterBatches = (File *) NULL;
+	hjstate->hj_InnerBatches = (File *) NULL;
+	hjstate->hj_OuterReadPos = (char *) NULL;
+	hjstate->hj_OuterReadBlk = (int) 0;
+
+	hjstate->jstate.cs_OuterTupleSlot = (TupleTableSlot *) NULL;
+	hjstate->jstate.cs_TupFromTlist = (bool) false;
+	
+	/* 
+	 * if chgParam of subnodes is not null then plans
+	 * will be re-scanned by first ExecProcNode.
+	 */
+	if (((Plan*) node)->lefttree->chgParam == NULL)
+		ExecReScan (((Plan*) node)->lefttree, exprCtxt, (Plan *) node);
+	if (((Plan*) node)->righttree->chgParam == NULL)
+		ExecReScan (((Plan*) node)->righttree, exprCtxt, (Plan *) node);
+	
+}
diff --git a/src/backend/executor/nodeIndexscan.c b/src/backend/executor/nodeIndexscan.c
index 6e220800f2e..d15c9bfb35a 100644
--- a/src/backend/executor/nodeIndexscan.c
+++ b/src/backend/executor/nodeIndexscan.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.13 1998/01/07 21:02:54 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.14 1998/02/13 03:26:49 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -247,7 +247,6 @@ ExecIndexReScan(IndexScan *node, ExprContext *exprCtxt, Plan *parent)
 	indexstate = node->indxstate;
 	estate = node->scan.plan.state;
 	direction = estate->es_direction;
-	indexstate = node->indxstate;
 	numIndices = indexstate->iss_NumIndices;
 	scanDescs = indexstate->iss_ScanDescs;
 	scanKeys = indexstate->iss_ScanKeys;
@@ -268,7 +267,11 @@ ExecIndexReScan(IndexScan *node, ExprContext *exprCtxt, Plan *parent)
 		n_keys = numScanKeys[indexPtr];
 		run_keys = (int *) runtimeKeyInfo[indexPtr];
 		scan_keys = (ScanKey) scanKeys[indexPtr];
-
+		
+		/* it's possible in subselects */
+		if (exprCtxt == NULL)
+			exprCtxt = node->scan.scanstate->cstate.cs_ExprContext;
+		
 		for (j = 0; j < n_keys; j++)
 		{
 
@@ -485,6 +488,8 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 	HeapScanDesc currentScanDesc;
 	ScanDirection direction;
 	int			baseid;
+	
+	List	   *execParam = NULL;
 
 	/* ----------------
 	 *	assign execution state to node
@@ -696,7 +701,6 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 				 */
 				run_keys[j] = NO_OP;
 				scanvalue = ((Const *) leftop)->constvalue;
-#ifdef INDEXSCAN_PATCH
 			}
 			else if (IsA(leftop, Param))
 			{
@@ -707,13 +711,24 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 				 *	it identifies the value to place in our scan key.
 				 * ----------------
 				 */
-				run_keys[j] = NO_OP;
-				scanvalue = ExecEvalParam((Param *) leftop,
-										scanstate->cstate.cs_ExprContext,
-										  &isnull);
-				if (isnull)
-					flags |= SK_ISNULL;
-#endif
+				
+				/* Life was so easy before ... subselects */
+				if ( ((Param *) leftop)->paramkind == PARAM_EXEC )
+				{
+					have_runtime_keys = true;
+					run_keys[j] = LEFT_OP;
+					execParam = lappendi (execParam, ((Param*) leftop)->paramid);
+				}
+				else
+				{
+					scanvalue = ExecEvalParam((Param *) leftop,
+											  scanstate->cstate.cs_ExprContext,
+											  &isnull);
+					if (isnull)
+						flags |= SK_ISNULL;
+					
+					run_keys[j] = NO_OP;
+				}
 			}
 			else if (leftop != NULL &&
 					 is_funcclause(leftop) &&
@@ -779,7 +794,6 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 				 */
 				run_keys[j] = NO_OP;
 				scanvalue = ((Const *) rightop)->constvalue;
-#ifdef INDEXSCAN_PATCH
 			}
 			else if (IsA(rightop, Param))
 			{
@@ -790,13 +804,24 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 				 *	it identifies the value to place in our scan key.
 				 * ----------------
 				 */
-				run_keys[j] = NO_OP;
-				scanvalue = ExecEvalParam((Param *) rightop,
-										scanstate->cstate.cs_ExprContext,
-										  &isnull);
-				if (isnull)
-					flags |= SK_ISNULL;
-#endif
+				
+				/* Life was so easy before ... subselects */
+				if ( ((Param *) rightop)->paramkind == PARAM_EXEC )
+				{
+					have_runtime_keys = true;
+					run_keys[j] = RIGHT_OP;
+					execParam = lappendi (execParam, ((Param*) rightop)->paramid);
+				}
+				else
+				{
+					scanvalue = ExecEvalParam((Param *) rightop,
+											  scanstate->cstate.cs_ExprContext,
+											  &isnull);
+					if (isnull)
+						flags |= SK_ISNULL;
+					
+					run_keys[j] = NO_OP;
+				}
 			}
 			else if (rightop != NULL &&
 					 is_funcclause(rightop) &&
@@ -964,7 +989,13 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 	indexstate->iss_ScanDescs = scanDescs;
 
 	indexstate->cstate.cs_TupFromTlist = false;
-
+	
+	/* 
+	 * if there are some PARAM_EXEC in skankeys then
+	 * force index rescan on first scan.
+	 */
+	((Plan*) node)->chgParam = execParam;
+	
 	/* ----------------
 	 *	all done.
 	 * ----------------
diff --git a/src/backend/executor/nodeMaterial.c b/src/backend/executor/nodeMaterial.c
index f821459f2a7..800bab2b315 100644
--- a/src/backend/executor/nodeMaterial.c
+++ b/src/backend/executor/nodeMaterial.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeMaterial.c,v 1.11 1997/11/28 17:27:25 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeMaterial.c,v 1.12 1998/02/13 03:26:50 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -341,6 +341,27 @@ ExecEndMaterial(Material *node)
 	ExecClearTuple(matstate->csstate.css_ScanTupleSlot);
 }
 
+/* ----------------------------------------------------------------
+ *		ExecMaterialReScan
+ *
+ *		Rescans the temporary relation.
+ * ----------------------------------------------------------------
+ */
+void
+ExecMaterialReScan(Material *node, ExprContext *exprCtxt, Plan *parent)
+{
+	MaterialState  *matstate = node->matstate;
+
+	if (matstate->mat_Flag == false)
+		return;
+	
+	matstate->csstate.css_currentScanDesc = 
+					ExecReScanR (matstate->csstate.css_currentRelation, 
+								 matstate->csstate.css_currentScanDesc, 
+								 node->plan.state->es_direction, 0, NULL);
+	
+}
+
 #ifdef NOT_USED					/* not used */
 /* ----------------------------------------------------------------
  *		ExecMaterialMarkPos
diff --git a/src/backend/executor/nodeNestloop.c b/src/backend/executor/nodeNestloop.c
index ff9327ee994..4d1fb12cd2f 100644
--- a/src/backend/executor/nodeNestloop.c
+++ b/src/backend/executor/nodeNestloop.c
@@ -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;
+}
diff --git a/src/backend/executor/nodeResult.c b/src/backend/executor/nodeResult.c
index 78f8c762619..7dcb9376ca0 100644
--- a/src/backend/executor/nodeResult.c
+++ b/src/backend/executor/nodeResult.c
@@ -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);
+	
+}
diff --git a/src/backend/executor/nodeSubplan.c b/src/backend/executor/nodeSubplan.c
new file mode 100644
index 00000000000..610f0a09643
--- /dev/null
+++ b/src/backend/executor/nodeSubplan.c
@@ -0,0 +1,280 @@
+/*-------------------------------------------------------------------------
+ *
+ * nodeSubplan.c--
+ *	  routines to support subselects
+ *
+ *-------------------------------------------------------------------------
+ */
+/*
+ *	 INTERFACE ROUTINES
+ *		ExecSubPlan	 - process a subselect
+ *		ExecInitSubPlan - initialize a subselect
+ *		ExecEndSubPlan  - shut down a subselect
+ */
+#include "postgres.h"
+
+#include "access/heapam.h"
+#include "tcop/pquery.h"
+#include "executor/executor.h"
+#include "executor/execdebug.h"
+#include "executor/nodeSubplan.h"
+
+/* ----------------------------------------------------------------
+ *		ExecSubPlan(node)
+ *
+ * ----------------------------------------------------------------
+ */
+Datum
+ExecSubPlan(SubPlan *node, List *pvar, ExprContext *econtext)
+{
+	Plan		   *plan = node->plan;
+	SubLink		   *sublink = node->sublink;
+	TupleTableSlot *slot;
+	List		   *lst;
+	bool			result = false;
+	bool			found = false;
+	
+	if ( node->setParam != NULL )
+		elog (ERROR, "ExecSubPlan: can't set parent params from subquery");
+	
+	/*
+	 * Set Params of this plan from parent plan correlation Vars
+	 */
+	if ( node->parParam != NULL )
+	{
+		foreach (lst, node->parParam)
+		{
+			ParamExecData   *prm = &(econtext->ecxt_param_exec_vals[lfirsti(lst)]);
+			
+			prm->value = ExecEvalExpr ((Node*) lfirst(pvar), 
+											econtext, 
+											&(prm->isnull), NULL);
+			pvar = lnext (pvar);
+		}
+		plan->chgParam = nconc (plan->chgParam, listCopy(node->parParam));
+	}
+	
+	ExecReScan (plan, (ExprContext*) NULL, plan);
+	
+	for (slot = ExecProcNode (plan, plan); 
+			!TupIsNull(slot); 
+				slot = ExecProcNode (plan, plan))
+	{
+		HeapTuple	tup = slot->val;
+		TupleDesc	tdesc = slot->ttc_tupleDescriptor;
+		int			i = 1;
+		
+		if ( sublink->subLinkType == EXPR_SUBLINK && found )
+		{
+			elog (ERROR, "ExecSubPlan: more than one tuple returned by expression subselect");
+			return ((Datum) false);
+		}
+		
+		if ( sublink->subLinkType == EXISTS_SUBLINK )
+			return ((Datum) true);
+		
+		found = true;
+		
+		foreach (lst, sublink->oper)
+		{
+			Expr   *expr = (Expr*) lfirst(lst);
+			Const  *con = lsecond(expr->args);
+			bool	isnull;
+			
+			con->constvalue = heap_getattr (tup, i, tdesc, &(con->constisnull));
+			result = (bool) ExecEvalExpr ((Node*) expr, econtext, &isnull, (bool*) NULL);
+			if ( isnull )
+				result = false;
+			if ( (!result && !(sublink->useor)) || (result && sublink->useor) )
+				break;
+			i++;
+		}
+			
+		if ( (!result && sublink->subLinkType == ALL_SUBLINK) ||
+				(result && sublink->subLinkType == ANY_SUBLINK) )
+			break;
+	}
+	
+	return ((Datum) result);
+}
+
+/* ----------------------------------------------------------------
+ *		ExecInitSubPlan
+ *
+ * ----------------------------------------------------------------
+ */
+bool
+ExecInitSubPlan(SubPlan *node, EState *estate, Plan *parent)
+{
+	EState   *sp_estate = CreateExecutorState ();
+	
+	sp_estate->es_range_table = node->rtable;
+	sp_estate->es_param_list_info = estate->es_param_list_info;
+	sp_estate->es_param_exec_vals = estate->es_param_exec_vals;
+	sp_estate->es_tupleTable = 
+		ExecCreateTupleTable (ExecCountSlotsNode(node->plan) + 10);
+	pfree (sp_estate->es_refcount);
+	sp_estate->es_refcount = estate->es_refcount;
+	
+	if ( !ExecInitNode (node->plan, sp_estate, NULL) )
+		return (false);
+	
+	node->shutdown = true;
+	
+	/*
+	 * If this plan is un-correlated or undirect correlated one and 
+	 * want to set params for parent plan then prepare parameters.
+	 */
+	if ( node->setParam != NULL )
+	{
+		List   *lst;
+		
+		foreach (lst, node->setParam)
+		{
+			ParamExecData   *prm = &(estate->es_param_exec_vals[lfirsti(lst)]);
+			
+			prm->execPlan = node;
+		}
+		/*
+		 * Note that in the case of un-correlated subqueries we don't care
+		 * about setting parent->chgParam here: indices take care about it,
+		 * for others - it doesn't matter...
+		 */
+	}
+	
+	return (true);
+}
+
+/* ----------------------------------------------------------------
+ *		ExecSetParamPlan
+ *
+ *		Executes plan of node and sets parameters.
+ * ----------------------------------------------------------------
+ */
+void
+ExecSetParamPlan (SubPlan *node)
+{
+	Plan		   *plan = node->plan;
+	SubLink		   *sublink = node->sublink;
+	TupleTableSlot *slot;
+	List		   *lst;
+	bool			found = false;
+	
+	if ( sublink->subLinkType == ANY_SUBLINK ||
+			sublink->subLinkType == ALL_SUBLINK )
+		elog (ERROR, "ExecSetParamPlan: ANY/ALL subselect unsupported");
+	
+	if ( plan->chgParam != NULL )
+		ExecReScan (plan, (ExprContext*) NULL, plan);
+	
+	for (slot = ExecProcNode (plan, plan); 
+			!TupIsNull(slot); 
+				slot = ExecProcNode (plan, plan))
+	{
+		HeapTuple	tup = slot->val;
+		TupleDesc	tdesc = slot->ttc_tupleDescriptor;
+		int			i = 1;
+		
+		if ( sublink->subLinkType == EXPR_SUBLINK && found )
+		{
+			elog (ERROR, "ExecSetParamPlan: more than one tuple returned by expression subselect");
+			return;
+		}
+		
+		found = true;
+		
+		if ( sublink->subLinkType == EXISTS_SUBLINK )
+		{
+			ParamExecData   *prm = &(plan->state->es_param_exec_vals[lfirsti(node->setParam)]);
+			
+			prm->execPlan = NULL;
+			prm->value = (Datum) true;
+			prm->isnull = false;
+			break;
+		}
+		
+		foreach (lst, node->setParam)
+		{
+			ParamExecData   *prm = &(plan->state->es_param_exec_vals[lfirsti(lst)]);
+			
+			prm->execPlan = NULL;
+			prm->value = heap_getattr (tup, i, tdesc, &(prm->isnull));
+			i++;
+		}
+	}
+	
+	if ( !found )
+	{
+		if ( sublink->subLinkType == EXISTS_SUBLINK )
+		{
+			ParamExecData   *prm = &(plan->state->es_param_exec_vals[lfirsti(node->setParam)]);
+			
+			prm->execPlan = NULL;
+			prm->value = (Datum) false;
+			prm->isnull = false;
+		}
+		else
+		{
+			foreach (lst, node->setParam)
+			{
+				ParamExecData   *prm = &(plan->state->es_param_exec_vals[lfirsti(lst)]);
+				
+				prm->execPlan = NULL;
+				prm->value = (Datum) NULL;
+				prm->isnull = true;
+			}
+		}
+	}
+	
+	if ( plan->extParam == NULL )	/* un-correlated ... */
+	{
+		ExecEndNode (plan, plan);
+		node->shutdown = false;
+	}
+}
+
+/* ----------------------------------------------------------------
+ *		ExecEndSubPlan
+ * ----------------------------------------------------------------
+ */
+void
+ExecEndSubPlan(SubPlan *node)
+{
+	
+	if ( node->shutdown )
+	{
+		ExecEndNode (node->plan, node->plan);
+		node->shutdown = false;
+	}
+	
+}
+
+void 
+ExecReScanSetParamPlan (SubPlan *node, Plan *parent)
+{
+	Plan   *plan = node->plan;
+	List   *lst;
+	
+	if ( node->parParam != NULL )
+		elog (ERROR, "ExecReScanSetParamPlan: direct correlated subquery unsupported, yet");
+	if ( node->setParam == NULL )
+		elog (ERROR, "ExecReScanSetParamPlan: setParam list is NULL");
+	if ( plan->extParam == NULL )
+		elog (ERROR, "ExecReScanSetParamPlan: extParam list of plan is NULL");
+	
+	/* 
+	 * Don't actual re-scan: ExecSetParamPlan does re-scan if 
+	 * node->plan->chgParam is not NULL...
+	ExecReScan (plan, NULL, plan);
+	 */
+	
+	foreach (lst, node->setParam)
+	{
+		ParamExecData   *prm = &(plan->state->es_param_exec_vals[lfirsti(lst)]);
+		
+		prm->execPlan = node;
+	}
+	
+	parent->chgParam = nconc (parent->chgParam, listCopy(node->setParam));
+
+}