https://bugzilla.wikimedia.org/show_bug.cgi?id=34568

--- Comment #2 from Umherirrender <umherirrender_de...@web.de> 2012-03-04 
09:56:28 UTC ---
But on PendingChanges this condition is also used, but it makes no problem,
because there is no group by.

Maybe a parent_id = 0 can help to get the first revision of a page, and than
the MIN(rev_timestamp) is cheaper or not needed, because in most cases there is
only one revision with parent_id = 0 for a page_id.

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