https://bugzilla.wikimedia.org/show_bug.cgi?id=48875

--- Comment #13 from Brad Jorsch <bjor...@wikimedia.org> ---
Besides row counts, the database also maintains information on the distribution
of keys in the database, which may change the query plans if the distribution
on one instance of the table is different from another. See
https://dev.mysql.com/doc/refman/5.5/en/analyze-table.html for some details.

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