The following bug has been logged on the website:

Bug reference:      7511
Logged by:          Adrian Dries
Email address:      i...@avdd.co
PostgreSQL version: Unsupported/Unknown
Operating system:   any
Description:        

In trying 9.2 I find pg_stat_activity.procpid has been renamed to pid.

http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=4f42b546fd87a80be30c53a0f2c897acb826ad52

It seems the premise of this is

If we're going to rename current_query to query--what Scott's patch does
here--that will force all code using pg_stat_activity to be rewritten. This
seems like the perfect time to also change "procpid" to "pid", finally blow
away that wart.

A premise that is untrue: changing a subset of columns on a relation does
not force "all code" using that relation to be rewritten:

  SELECT procpid FROM pg_stat_activity WHERE procpid <> pg_backend_pid()





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