patch review, please: Autovacuum/Vacuum times via stats.

Greetings,   I've got a patch to be reviewed for having the stats system keep
track of the last
time a table was vacuumed or analyzed either by the user or via
AutoVacuum.

The patch is at:
http://www.lerctr.org/~ler/pg-dev/vacuum-autovacuum-times-stats.diff

I'd appreciate a full review, it includes docs as well.

Thanks!

LER


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Larry Rosenman
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