Don't trash input list structure in does_not_exist_skipping().

tglsfdc · tglsfdc · commit 03787f63921e · 2012-11-08T11:34:37.000-05:00
The trigger and rule cases need to split up the input name list, but
they mustn't corrupt the passed-in data structure, since it could be part
of a cached utility-statement parsetree.  Per bug #7641.
diff --git a/src/backend/commands/dropcmds.c b/src/backend/commands/dropcmds.c
@@ -203,13 +203,13 @@ does_not_exist_skipping(ObjectType objtype, List *objname, List *objargs)
 		case OBJECT_TRIGGER:
 			msg = gettext_noop("trigger \"%s\" for table \"%s\" does not exist, skipping");
 			name = strVal(llast(objname));
-			args = NameListToString(list_truncate(objname,
+			args = NameListToString(list_truncate(list_copy(objname),
 												  list_length(objname) - 1));
 			break;
 		case OBJECT_RULE:
 			msg = gettext_noop("rule \"%s\" for relation \"%s\" does not exist, skipping");
 			name = strVal(llast(objname));
-			args = NameListToString(list_truncate(objname,
+			args = NameListToString(list_truncate(list_copy(objname),
 												  list_length(objname) - 1));
 			break;
 		case OBJECT_FDW:
