Fix background update for sliding sync (find previous membership) (v2)#17632
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| ORDER BY event_stream_ordering DESC | ||
| AND m.user_id = ? | ||
| AND e.stream_ordering < ? | ||
| ORDER BY e.stream_ordering DESC |
| SELECT event_id, membership | ||
| FROM room_memberships | ||
| FROM room_memberships AS m | ||
| INNER JOIN events AS e USING (room_id, event_id) |
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Just double-checking that looking it up this way isn't slow vs just by (event_id)
The events table does have "events_room_stream" btree (room_id, stream_ordering) so I think this could work fast.
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Yeah, empirically seems fast. Also helped by the fact these rooms should have very few events in them (generally just an invite then rejection)
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This reverts commit ab414f2.
Introduced in #17512