psql's \do was going out of its way to lie about the result type of

operators.  Should report the declared oprresult type, not the return type
of the underlying proc, which might be only binary-compatible (cf.
textcat entries).

src/bin/psql/describe.c

@@ -3,7 +3,7 @@
  *
  * Copyright 2000 by PostgreSQL Global Development Group
  *
- * $Header: /cvsroot/pgsql/src/bin/psql/describe.c,v 1.41 2001/10/25 05:49:53 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/describe.c,v 1.42 2001/11/12 15:57:08 tgl Exp $
  */
 #include "postgres_fe.h"
 #include "describe.h"
@@ -213,15 +213,14 @@ describeOperators(const char *name)
 			 "SELECT o.oprname AS \"%s\",\n"
 			 "  CASE WHEN o.oprkind='l' THEN NULL ELSE format_type(o.oprleft, NULL) END AS \"%s\",\n"
 			 "  CASE WHEN o.oprkind='r' THEN NULL ELSE format_type(o.oprright, NULL) END AS \"%s\",\n"
-			 "  format_type(p.prorettype, NULL) AS \"%s\",\n"
-			 "  obj_description(p.oid, 'pg_proc') as \"%s\"\n"
-			 "FROM pg_proc p, pg_operator o\n"
-			 "WHERE RegprocToOid(o.oprcode) = p.oid\n",
+			 "  format_type(o.oprresult, NULL) AS \"%s\",\n"
+			 "  obj_description(o.oprcode, 'pg_proc') AS \"%s\"\n"
+			 "FROM pg_operator o\n",
 			 _("Name"), _("Left arg type"), _("Right arg type"),
 			 _("Result type"), _("Description"));
 	if (name)
 	{
-		strcat(buf, "  AND o.oprname = '");
+		strcat(buf, "WHERE o.oprname = '");
 		strncat(buf, name, REGEXP_CUTOFF);
 		strcat(buf, "'\n");
 	}