Have CREATE TABLE AS and REFRESH return an OID

Other DDL commands are already returning the OID, which is required for
future additional event trigger work.  This is merely making these
commands in line with the rest of utility command support.

src/backend/commands/createas.c

@@ -55,6 +55,9 @@ typedef struct
 	BulkInsertState bistate;	/* bulk insert state */
 } DR_intorel;
 
+/* the OID of the created table, for ExecCreateTableAs consumption */
+static Oid	CreateAsRelid = InvalidOid;
+
 static void intorel_startup(DestReceiver *self, int operation, TupleDesc typeinfo);
 static void intorel_receive(TupleTableSlot *slot, DestReceiver *self);
 static void intorel_shutdown(DestReceiver *self);
@@ -64,7 +67,7 @@ static void intorel_destroy(DestReceiver *self);
 /*
  * ExecCreateTableAs -- execute a CREATE TABLE AS command
  */
-void
+Oid
 ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
 				  ParamListInfo params, char *completionTag)
 {
@@ -75,6 +78,7 @@ ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
 	Oid			save_userid = InvalidOid;
 	int			save_sec_context = 0;
 	int			save_nestlevel = 0;
+	Oid			relOid;
 	List	   *rewritten;
 	PlannedStmt *plan;
 	QueryDesc  *queryDesc;
@@ -98,7 +102,9 @@ ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
 		Assert(!is_matview);	/* excluded by syntax */
 		ExecuteQuery(estmt, into, queryString, params, dest, completionTag);
 
-		return;
+		relOid = CreateAsRelid;
+		CreateAsRelid = InvalidOid;
+		return relOid;
 	}
 	Assert(query->commandType == CMD_SELECT);
 
@@ -190,6 +196,11 @@ ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
 		/* Restore userid and security context */
 		SetUserIdAndSecContext(save_userid, save_sec_context);
 	}
+
+	relOid = CreateAsRelid;
+	CreateAsRelid = InvalidOid;
+
+	return relOid;
 }
 
 /*
@@ -421,6 +432,9 @@ intorel_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
 	myState->rel = intoRelationDesc;
 	myState->output_cid = GetCurrentCommandId(true);
 
+	/* and remember the new relation's OID for ExecCreateTableAs */
+	CreateAsRelid = RelationGetRelid(myState->rel);
+
 	/*
 	 * We can skip WAL-logging the insertions, unless PITR or streaming
 	 * replication is in use. We can skip the FSM in any case.

src/backend/commands/matview.c

@@ -132,7 +132,7 @@ SetMatViewPopulatedState(Relation relation, bool newstate)
  * The matview's "populated" state is changed based on whether the contents
  * reflect the result set of the materialized view's query.
  */
-void
+Oid
 ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
 				   ParamListInfo params, char *completionTag)
 {
@@ -281,6 +281,8 @@ ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
 	}
 	else
 		refresh_by_heap_swap(matviewOid, OIDNewHeap);
+
+	return matviewOid;
 }
 
 /*

src/include/commands/createas.h

@@ -19,7 +19,7 @@
 #include "tcop/dest.h"
 
 
-extern void ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
+extern Oid	ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
 				  ParamListInfo params, char *completionTag);
 
 extern int	GetIntoRelEFlags(IntoClause *intoClause);

src/include/commands/matview.h

@@ -22,7 +22,7 @@
 
 extern void SetMatViewPopulatedState(Relation relation, bool newstate);
 
-extern void ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
+extern Oid ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
 				   ParamListInfo params, char *completionTag);
 
 extern DestReceiver *CreateTransientRelDestReceiver(Oid oid);