Appears there is a problem finding the opclass when indexing a domain.

CREATE DOMAIN newint as int4;
CREATE TABLE tab (col newint unique);
ERROR:  data type newint has no default operator class for access method
"btree"
        You must specify an operator class for the index or define a
        default operator class for the data type


Specifically, GetDefaultOpClass() finds 0 exact matches and 3 binary
compatible matches.  Fetching getBaseType() of the attribute fixes the
problem for domains (see attachment).

Rod Taylor

src/backend/commands/indexcmds.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.81 2002/08/07 21:45:01 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.82 2002/08/15 02:53:35 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -482,6 +482,9 @@ GetDefaultOpClass(Oid attrType, Oid accessMethodId)
 	Oid			exactOid = InvalidOid;
 	Oid			compatibleOid = InvalidOid;
 
+	/* It could be a domain */
+	attrType = getBaseType(attrType);
+
 	/*
 	 * We scan through all the opclasses available for the access method,
 	 * looking for one that is marked default and matches the target type