Make the new pg_stat_get_activity use OUT parameters, so you don't have to

Magnus Hagander <magnus@hagander.net>

Commit: a6d6a9c9a83951b9d82390ec421f4cec801d3fa7
Author: Magnus Hagander <magnus@hagander.net>
Date: 2008-05-08T08:58:59Z
Releases: 8.4.0
Make the new pg_stat_get_activity use OUT parameters, so you don't have to
specify the column names and types. Also simplifies the view.

Per comments from Tom.

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