[refer #PGPRO-2887] Prohibit autovacuum for global temporary tables

Author: knizhnik

src/backend/access/gist/gistutil.c

@@ -1028,7 +1028,8 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+		rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple

src/backend/commands/tablecmds.c

@@ -586,7 +586,8 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP
+		&& stmt->relation->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));

src/backend/postmaster/autovacuum.c

@@ -2069,7 +2069,8 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2155,8 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 			continue;
 
 		relid = classForm->oid;
@@ -2239,7 +2241,8 @@ do_autovacuum(void)
 		 */
 		if (!((classForm->relkind == RELKIND_RELATION ||
 			   classForm->relkind == RELKIND_MATVIEW) &&
-			  classForm->relpersistence == RELPERSISTENCE_TEMP))
+			  (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			   classForm->relpersistence == RELPERSISTENCE_SESSION)))
 		{
 			UnlockRelationOid(relid, AccessExclusiveLock);
 			continue;