It is a cleanup patch apart from SELinux and security framework.

Now, EnableDisableRule() checks ownership of the relation which
owns the rewrite rule to be enabled/disabled.

But it has the following call path, and this check is already done
in the ATPrepCmd().

 ATExecCmd()
  -> ATExecEnableDisableRule()
   -> EnableDisableRule()

This patch removes redundant permission checks.
No need to check same things twice.

Also see the related discussions:
  http://archives.postgresql.org/pgsql-hackers/2009-09/msg01593.php
  http://archives.postgresql.org/pgsql-hackers/2009-09/msg01839.php
  http://archives.postgresql.org/pgsql-hackers/2009-09/msg01840.php

Thanks,
-- 
OSS Platform Development Division, NEC
KaiGai Kohei <kai...@ak.jp.nec.com>

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