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moodle/mod/forum/classes/privacy
David Mudrák e2f1e10225 MDL-68647 forum: Improve the SQL performance in the privacy provider
The idea here is to replace the existing LEFT JOINs and
OR / IS NOT NULL conditions with INNER JOINs and ANDs. So we gather the
discussions data from all three areas in individual queries, make their
UNION. The GROUP BY was present before and maybe it is not even needed
any more (due to how UNION works) but it should not hurt to keep it.

This leads to significantly improved performance.
2020-07-21 11:53:08 +02:00
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