I wrote this query to find all page moves done in fawiki in 2017, and determine how many edits the performing user had prior to that page move. The query tries to use indexes, as much as I could think of, and yet it runs for a very long time (more than 20 min, at which point it gets killed).

Any ideas on how to further optimize this query is appreciated!

Thanks,
Huji


use fawiki_p;
select
  log_id,
  log_timestamp,
  log_user,
  log_user_text,
  log_title,
  log_comment,
  log_page,
  page_namespace,
  case when ug_group = 'bot' then 1 else 0 end as user_is_bot,
  (
    select count(*)
    from revision_userindex
    where
      rev_user = log_user
      and rev_timestamp < log_timestamp
  ) as rev_count_before_move
from logging
join page
  on page_id = log_page
left join user_groups
  on log_user = ug_user
  and ug_group = 'bot'
where log_action = 'move'
and log_timestamp > '20170101000000'