rename index fields bug

I've just stumbled across this, which appears to be a regression from 
8.4 that is present in 9.0 and master:
   andrew=# create table foo (x int primary key);   NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index
"foo_pkey"for table "foo"   CREATE TABLE   andrew=# alter table foo rename x to y;   ALTER TABLE   andrew=# select
attnamefrom pg_attribute where attrelid =   'foo_pkey'::regclass;     attname   ---------     x   (1 row)
 

In 8.4 the index attribute is renamed correctly.

This only came to light because it caused a londiste failure, making 
londiste think that there wasn't a key field. Arguably londiste should 
be using pg_index.indkey, but this should still work right.


cheers

andrew