Rebased on c727f511b.
This patch record was "closed for lack of interest", but I think what's
actually needed is committer review of which approach to take.
- add backend functions but do not modify psql ?
- add to psql slash-plus commnds ?
- introduce psql double-plus commands for new options ?
- change pre-existing psql plus commands to only show size with
double-plus ?
- go back to the original, two-line client-side sum() ?
Until then, the patchset is organized with those questions in mind.
--
Justin