Change CREATE TABLE AS / SELECT INTO to create the new table with OIDs,

for backwards compatibility with pre-7.3 behavior.  Per discussion on
pgsql-general and pgsql-hackers.

src/backend/executor/execMain.c

@@ -27,7 +27,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.180 2002/10/14 16:51:30 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.180.2.1 2003/01/23 05:10:56 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -450,6 +450,7 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 {
 	List	   *rangeTable;
 	Relation	intoRelationDesc;
+	bool		do_select_into;
 	TupleDesc	tupType;
 
 	/*
@@ -527,6 +528,26 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 		estate->es_result_relation_info = NULL;
 	}
 
+	/*
+	 * Detect whether we're doing SELECT INTO.  If so, set the force_oids
+	 * flag appropriately so that the plan tree will be initialized with
+	 * the correct tuple descriptors.
+	 */
+	do_select_into = false;
+
+	if (operation == CMD_SELECT &&
+		!parseTree->isPortal &&
+		parseTree->into != NULL)
+	{
+		do_select_into = true;
+		/*
+		 * For now, always create OIDs in SELECT INTO; this is for backwards
+		 * compatibility with pre-7.3 behavior.  Eventually we might want
+		 * to allow the user to choose.
+		 */
+		estate->es_force_oids = true;
+	}
+
 	/*
 	 * Have to lock relations selected for update
 	 */
@@ -686,15 +707,8 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 	 */
 	intoRelationDesc = (Relation) NULL;
 
-	if (operation == CMD_SELECT)
+	if (do_select_into)
 	{
-		if (!parseTree->isPortal)
-		{
-			/*
-			 * a select into table --- need to create the "into" table
-			 */
-			if (parseTree->into != NULL)
-			{
 				char	   *intoName;
 				Oid			namespaceId;
 				AclResult	aclresult;
@@ -718,14 +732,6 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 				 */
 				tupdesc = CreateTupleDescCopy(tupType);
 
-				/*
-				 * Formerly we forced the output table to have OIDs, but
-				 * as of 7.3 it will not have OIDs, because it's too late
-				 * here to change the tupdescs of the already-initialized
-				 * plan tree.  (Perhaps we could recurse and change them
-				 * all, but it's not really worth the trouble IMHO...)
-				 */
-
 				intoRelationId =
 					heap_create_with_catalog(intoName,
 											 namespaceId,
@@ -752,8 +758,6 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
 
 				intoRelationDesc = heap_open(intoRelationId,
 											 AccessExclusiveLock);
-			}
-		}
 	}
 
 	estate->es_into_relation_descriptor = intoRelationDesc;
@@ -1852,6 +1856,7 @@ EvalPlanQual(EState *estate, Index rti, ItemPointer tid)
 	if (estate->es_origPlan->nParamExec > 0)
 		memset(epqstate->es_param_exec_vals, 0,
 			   estate->es_origPlan->nParamExec * sizeof(ParamExecData));
+	epqstate->es_force_oids = estate->es_force_oids;
 	memset(epqstate->es_evTupleNull, false, rtsize * sizeof(bool));
 	epqstate->es_useEvalPlan = false;
 	Assert(epqstate->es_tupleTable == NULL);

src/backend/executor/execUtils.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.90 2002/09/04 20:31:18 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.90.2.1 2003/01/23 05:10:56 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -310,14 +310,23 @@ ExecAssignResultTypeFromTL(Plan *node, CommonState *commonstate)
 	 * have to make the decision on a per-relation basis as we initialize
 	 * each of the child plans of the topmost Append plan.	So, this is
 	 * ugly but it works, for now ...
+	 *
+	 * SELECT INTO is also pretty grotty, because we don't yet have the
+	 * INTO relation's descriptor at this point; we have to look aside
+	 * at a flag set by InitPlan().
 	 */
-	ri = node->state->es_result_relation_info;
-	if (ri != NULL)
+	if (node->state->es_force_oids)
+		hasoid = true;
+	else
 	{
-		Relation	rel = ri->ri_RelationDesc;
+		ri = node->state->es_result_relation_info;
+		if (ri != NULL)
+		{
+			Relation	rel = ri->ri_RelationDesc;
 
-		if (rel != NULL)
-			hasoid = rel->rd_rel->relhasoids;
+			if (rel != NULL)
+				hasoid = rel->rd_rel->relhasoids;
+		}
 	}
 
 	tupDesc = ExecTypeFromTL(node->targetlist, hasoid);

src/include/nodes/execnodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: execnodes.h,v 1.75 2002/09/04 20:31:42 momjian Exp $
+ * $Id: execnodes.h,v 1.75.2.1 2003/01/23 05:10:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -306,6 +306,8 @@ typedef struct EState
 	uint32		es_processed;	/* # of tuples processed */
 	Oid			es_lastoid;		/* last oid processed (by INSERT) */
 	List	   *es_rowMark;		/* not good place, but there is no other */
+	bool		es_force_oids;	/* true forces result tuples to have (space
+								 * for) OIDs --- used for SELECT INTO */
 	MemoryContext es_query_cxt; /* per-query context in which EState lives */
 
 	/*