Allow CASE statement to contain *only* untyped result clauses or nulls.

 Almost worked before, but forgot one place to check.
 Reported by Tatsuo Ishii.
Still does not do the right thing if inserting into a non-string target
 column. Should look for a type coersion later, but doesn't.

diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 257a0d73200405890a77c8051c9475585aee5eb9..683475c8755d1541225e043b5ebb54ef4d5c37d3 100644 (file)
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -467,7 +467,8 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
                                         * only bother with conversion if not NULL and
                                         * different type...
                                         */
-                                       if (wtype && (wtype != ptype))
+                                       if (wtype && (wtype != UNKNOWNOID)
+                                               && (wtype != ptype))
                                        {
                                                if (can_coerce_type(1, &wtype, &ptype))
                                                {