https://bugzilla.wikimedia.org/show_bug.cgi?id=68596

            Bug ID: 68596
           Summary: Rolling Active Editor is slow
           Product: Analytics
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Wikimetrics
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected]
       Web browser: ---
   Mobile Platform: ---

It's probably because user_id filter causes filtering of a ton of data
in-memory.  Pushing the filter into the subqueries should improve performance a
lot.

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