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Also optimize LatestEventNIDInRooms

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Till Faelligen 2024-05-17 10:41:28 +02:00
parent 3ca77f2bc0
commit 1ae5b5cb3d
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1 changed files with 15 additions and 3 deletions
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18
state/event_table.go
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@ -348,13 +348,25 @@ FROM room_ids,
return
}
// LatestEventNIDInRooms queries the latest events in each of the room IDs given, using highestNID as the highest event.
//
// The following query does:
//
// 1. Create a list of the passed in roomIDs (`room_ids` CTE)
// 2. Fetches the latest eventNIDs for each room using the data provided from room_ids (the `evs` LATERAL)
func (t *EventTable) LatestEventNIDInRooms(txn *sqlx.Tx, roomIDs []string, highestNID int64) (roomToNID map[string]int64, err error) {
// the position (event nid) may be for a random different room, so we need to find the highest nid <= this position for this room
var events []Event
err = txn.Select(
&events,
`SELECT event_nid, room_id FROM syncv3_events
WHERE event_nid IN (SELECT max(event_nid) FROM syncv3_events WHERE event_nid <= $1 AND room_id = ANY($2) GROUP BY room_id)`,
`
WITH room_ids AS (
select unnest($1) AS room_id
)
SELECT evs.event_nid, room_id
FROM room_ids,
LATERAL (
SELECT max(event_nid) event_nid FROM syncv3_events e WHERE e.room_id = room_ids.room_id AND event_nid <= $2
) AS evs;`,
highestNID, pq.StringArray(roomIDs),
)
if err == sql.ErrNoRows {