Fix thread BG update to not seq scan event_json (#11192)

For some reason the query optimiser decided to seq scan both tables,
rather than index scanning `event_json`.
This commit is contained in:
Erik Johnston 2021-10-27 12:33:21 +01:00 committed by GitHub
parent 2dbef6c10a
commit 72626b78ef
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 2 additions and 1 deletions

View File

@ -0,0 +1 @@
Experimental support for the thread relation defined in [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440).

View File

@ -1108,7 +1108,7 @@ class EventsBackgroundUpdatesStore(SQLBaseStore):
"""
SELECT event_id, json FROM event_json
LEFT JOIN event_relations USING (event_id)
WHERE event_id > ? AND relates_to_id IS NULL
WHERE event_id > ? AND event_relations.event_id IS NULL
ORDER BY event_id LIMIT ?
""",
(last_event_id, batch_size),