Avoid duplicate ExecTypeFromTL() call in ExecInitJunkFilter() by passing

in the TupleDesc that the caller already has (for call from ExecMain) or
can make just as easily as ExecInitJunkFilter() can (for call from
ExecAppend).  Also, don't bother to build a junk filter for an INSERT
operation that doesn't actually need one, which is the normal case.

src/backend/executor/execJunk.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execJunk.c,v 1.20 1999/07/17 20:16:56 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execJunk.c,v 1.21 1999/10/30 23:13:30 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -55,17 +55,18 @@
  * ExecInitJunkFilter
  *
  * Initialize the Junk filter.
+ *
+ * The initial targetlist and associated tuple descriptor are passed in.
  *-------------------------------------------------------------------------
  */
 JunkFilter *
-ExecInitJunkFilter(List *targetList)
+ExecInitJunkFilter(List *targetList, TupleDesc tupType)
 {
 	JunkFilter *junkfilter;
 	List	   *cleanTargetList;
 	int			len,
 				cleanLength;
-	TupleDesc	tupType,
-				cleanTupType;
+	TupleDesc	cleanTupType;
 	List	   *t;
 	TargetEntry *tle;
 	Resdom	   *resdom,
@@ -154,15 +155,11 @@ ExecInitJunkFilter(List *targetList)
 	}
 
 	/* ---------------------
-	 * Now calculate the tuple types for the original and the clean tuple
-	 *
-	 * XXX ExecTypeFromTL should be used sparingly.  Don't we already
-	 *	   have the tupType corresponding to the targetlist we are passed?
-	 *	   -cim 5/31/91
+	 * Now calculate the tuple type for the cleaned tuple (we were already
+	 * given the type for the original targetlist).
 	 * ---------------------
 	 */
-	tupType = (TupleDesc) ExecTypeFromTL(targetList);
-	cleanTupType = (TupleDesc) ExecTypeFromTL(cleanTargetList);
+	cleanTupType = ExecTypeFromTL(cleanTargetList);
 
 	len = ExecTargetListLength(targetList);
 	cleanLength = ExecTargetListLength(cleanTargetList);

src/backend/executor/execMain.c

@@ -26,7 +26,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.97 1999/10/07 04:23:01 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.98 1999/10/30 23:13:30 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -529,7 +529,6 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 	Relation	intoRelationDesc;
 	TupleDesc	tupType;
 	List	   *targetList;
-	int			len;
 
 	/*
 	 * get information from query descriptor
@@ -655,40 +654,43 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 	 */
 	tupType = ExecGetTupType(plan);		/* tuple descriptor */
 	targetList = plan->targetlist;
-	len = ExecTargetListLength(targetList);		/* number of attributes */
 
 	/*
-	 * now that we have the target list, initialize the junk filter if
-	 * this is a REPLACE or a DELETE query. We also init the junk filter
-	 * if this is an append query (there might be some rule lock info
-	 * there...) NOTE: in the future we might want to initialize the junk
-	 * filter for all queries. SELECT added by daveh@insightdist.com
-	 * 5/20/98 to allow ORDER/GROUP BY have an identifier missing from the
-	 * target.
+	 * Now that we have the target list, initialize the junk filter if needed.
+	 * SELECT and INSERT queries need a filter if there are any junk attrs
+	 * in the tlist.  UPDATE and DELETE always need one, since there's always
+	 * a junk 'ctid' attribute present --- no need to look first.
 	 */
 	{
 		bool		junk_filter_needed = false;
 		List	   *tlist;
 
-		if (operation == CMD_SELECT)
+		switch (operation)
 		{
-			foreach(tlist, targetList)
-			{
-				TargetEntry *tle = lfirst(tlist);
-
-				if (tle->resdom->resjunk)
+			case CMD_SELECT:
+			case CMD_INSERT:
+				foreach(tlist, targetList)
 				{
-					junk_filter_needed = true;
-					break;
+					TargetEntry *tle = (TargetEntry *) lfirst(tlist);
+
+					if (tle->resdom->resjunk)
+					{
+						junk_filter_needed = true;
+						break;
+					}
 				}
-			}
+				break;
+			case CMD_UPDATE:
+			case CMD_DELETE:
+				junk_filter_needed = true;
+				break;
+			default:
+				break;
 		}
 
-		if (operation == CMD_UPDATE || operation == CMD_DELETE ||
-			operation == CMD_INSERT ||
-			(operation == CMD_SELECT && junk_filter_needed))
+		if (junk_filter_needed)
 		{
-			JunkFilter *j = (JunkFilter *) ExecInitJunkFilter(targetList);
+			JunkFilter *j = ExecInitJunkFilter(targetList, tupType);
 
 			estate->es_junkFilter = j;
 

src/backend/executor/nodeAppend.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeAppend.c,v 1.26 1999/09/24 00:24:23 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeAppend.c,v 1.27 1999/10/30 23:13:30 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -276,9 +276,6 @@ ExecInitAppend(Append *node, EState *estate, Plan *parent)
 
 	for (i = 0; i < nplans; i++)
 	{
-		JunkFilter *j;
-		List	   *targetList;
-
 		/* ----------------
 		 *	NOTE: we first modify range table in
 		 *		  exec_append_initialize_next() and
@@ -302,9 +299,8 @@ ExecInitAppend(Append *node, EState *estate, Plan *parent)
 		if ((es_rri != (RelationInfo *) NULL) &&
 			(node->inheritrelid == es_rri->ri_RangeTableIndex))
 		{
-
-			targetList = initNode->targetlist;
-			j = (JunkFilter *) ExecInitJunkFilter(targetList);
+			JunkFilter *j = ExecInitJunkFilter(initNode->targetlist,
+											   ExecGetTupType(initNode));
 			junkList = lappend(junkList, j);
 		}
 
@@ -318,9 +314,7 @@ ExecInitAppend(Append *node, EState *estate, Plan *parent)
 	 * ----------------
 	 */
 	initNode = (Plan *) nth(0, appendplans);
-	ExecAssignResultType(&appendstate->cstate,
-/*						 ExecGetExecTupDesc(initNode), */
-						 ExecGetTupType(initNode));
+	ExecAssignResultType(&appendstate->cstate, ExecGetTupType(initNode));
 	appendstate->cstate.cs_ProjInfo = NULL;
 
 	/* ----------------
@@ -329,9 +323,7 @@ ExecInitAppend(Append *node, EState *estate, Plan *parent)
 	 */
 	appendstate->as_whichplan = 0;
 	exec_append_initialize_next(node);
-#ifdef NOT_USED
-	result = (List *) initialized[0];
-#endif
+
 	return TRUE;
 }
 

src/include/executor/executor.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: executor.h,v 1.38 1999/09/24 00:25:10 tgl Exp $
+ * $Id: executor.h,v 1.39 1999/10/30 23:13:30 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -53,7 +53,7 @@ extern Relation ExecCreatR(TupleDesc tupType, Oid relationOid);
 /*
  * prototypes from functions in execJunk.c
  */
-extern JunkFilter *ExecInitJunkFilter(List *targetList);
+extern JunkFilter *ExecInitJunkFilter(List *targetList, TupleDesc tupType);
 extern bool ExecGetJunkAttribute(JunkFilter *junkfilter, TupleTableSlot *slot,
 					 char *attrName, Datum *value, bool *isNull);
 extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot);