Is it an expected behavior?

  postgres=> CREATE SEQUENCE s;
  CREATE SEQUENCE
  postgres=> ALTER TABLE s RENAME sequence_name TO abcd;
  ALTER TABLE

  postgres=> CREATE TABLE t (a int primary key, b text);
  NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "t_pkey" for 
table "t"
  CREATE TABLE
  postgres=> ALTER TABLE t_pkey RENAME a TO xyz;
  ALTER TABLE

The documentation says:
  http://developer.postgresql.org/pgdocs/postgres/sql-altertable.html

    :
  RENAME
    The RENAME forms change the name of a table (or an index, sequence, or 
view) or
    the name of an individual column in a table. There is no effect on the 
stored data.

It seems to me the renameatt() should check relkind of the specified relation, 
and
raise an error if relkind != RELKIND_RELATION.

-- 
KaiGai Kohei <kai...@ak.jp.nec.com>

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