user_daily_contribs having been dropped, I am facing serious problems about a 
query. How to optimize this?
SELECT
    u.user_name,
    COUNT(rev.rev_id) AS contribs
FROM
    user u
    INNER JOIN user_groups ug
    ON u.user_id = ug.ug_user
    INNER JOIN revision_userindex rev
    ON rev.rev_user = u.user_id
WHERE
    ug.ug_group IN ('sysop', 'bureaucrat', 'checkuser', 'oversight')
    AND rev.rev_timestamp >= 20150928000000
GROUP BY
    u.user_name

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