8138600dd1
Even after specifying all the 3 columns to coerce MySQL into choosing the right multi-column index, it sometimes uses 2 separate indices and does an index_merge of them. This creates problems because the DeleteAt=0 search is essentially the entire Posts table, and causes a disastrously bad performance than even choosing the wrong index (idx_create_at). The problem with this approach is that we hardcode the decision to a specific index when MySQL was free to choose the right index depending on table statistics. However, there does not appear to be a case where this index can cause regressions than using some other index. Another option here was to set optimizer_switch="index_merge_intersection=off" at a session level for a transaction and then switch it back on after the query is done. However, this can cause some unintentional consequences because this setting is only available at a session level and not at a query level. There is no need to set something at the session level when an index hint suffices. https://mattermost.atlassian.net/browse/MM-27575
Mattermost is an open source, private cloud, Slack-alternative from https://mattermost.com.
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