Query in SQL function still not schema-safe; add a couple

more pg_catalog. qualifications.

src/backend/catalog/information_schema.sql

@@ -4,7 +4,7 @@
  *
  * Copyright (c) 2003-2009, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.55 2009/07/07 18:23:13 petere Exp $
+ * $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.56 2009/07/07 19:28:00 tgl Exp $
  */
 
 /*
@@ -106,7 +106,8 @@ $$SELECT
   CASE WHEN $1 IN (25, 1042, 1043) /* text, char, varchar */
        THEN CASE WHEN $2 = -1 /* default typmod */
                  THEN CAST(2^30 AS integer)
-                 ELSE information_schema._pg_char_max_length($1, $2) * pg_catalog.pg_encoding_max_length((SELECT encoding FROM pg_database WHERE datname = current_database()))
+                 ELSE information_schema._pg_char_max_length($1, $2) *
+                      pg_catalog.pg_encoding_max_length((SELECT encoding FROM pg_catalog.pg_database WHERE datname = pg_catalog.current_database()))
             END
        ELSE null
   END$$;