Dan Ungureanu f003e31e2f
PERF: Optimize search in private messages query (#14660)
* PERF: Remove JOIN on categories for PM search

JOIN on categories is not needed when searchin in private messages as
PMs are not categorized.

* DEV: Use == for string comparison

* PERF: Optimize query for allowed topic groups

There was a query that checked for all topics a user or their groups
were allowed to see. This used UNION between topic_allowed_users and
topic_allowed_groups which was very inefficient. That was replaced with
a OR condition that checks in either tables more efficiently.
2021-10-26 10:16:38 +03:00
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