https://bugzilla.wikimedia.org/show_bug.cgi?id=30051

--- Comment #10 from Florian Hackenberger <[email protected]> 2011-08-02 
16:12:25 UTC ---
I just had another look at the sub-select. To me it seems that there is no way
to rewrite that as a JOIN, because it's not a simple sub-select, but an
'EXISTS', 'NOT EXISTS' sub-select, which IMHO is impossible to rewrite into a
JOIN. I'm open to suggestions for how to solve that differently in SQL, though.

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