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ddb458343d
First reported in https://meta.discourse.org/t/-/202482/19 There are two optimizations being applied here: 1. Fetch a user's group ids in a seperate query instead of including it as a sub-query. When I tried a subquery, the query plan becomes very inefficient. 1. Join against the `topic_allowed_users` and `topic_allowed_groups` table instead of doing an IN against a subquery where we UNION the `topic_id`s from the two tables. From my profiling, this enables PG to do a backwards index scan on the `index_topics_on_timestamps_private` index. This commit fixes a bug where listing all messages was incorrectly excluding topics if a topic has been archived by a group even if the user did not belong to the group. This commit also fixes another bug where dismissing private messages selectively was subjected to the default limit of 30. |
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