Improve performance of fetching event reports when there are many of them
parent
2c6a7dfcbf
commit
1d1e8a5634
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@ -1600,25 +1600,37 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
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count = cast(Tuple[int], txn.fetchone())[0]
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sql = """
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WITH considered_event_reports AS (
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SELECT
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er.id,
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er.received_ts,
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er.room_id,
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er.event_id,
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er.user_id,
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er.content,
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room_stats_state.canonical_alias,
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room_stats_state.name
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FROM event_reports AS er
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JOIN room_stats_state
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ON room_stats_state.room_id = er.room_id
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{where_clause}
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ORDER BY er.received_ts {order}
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LIMIT ?
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OFFSET ?
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)
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-- only join on `events` after the LIMIT/OFFSET has been applied
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SELECT
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er.id,
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er.received_ts,
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er.room_id,
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er.event_id,
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er.user_id,
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er.content,
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cer.id,
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cer.received_ts,
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cer.room_id,
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cer.event_id,
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cer.user_id,
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cer.content,
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events.sender,
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room_stats_state.canonical_alias,
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room_stats_state.name
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FROM event_reports AS er
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LEFT JOIN events
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ON events.event_id = er.event_id
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JOIN room_stats_state
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ON room_stats_state.room_id = er.room_id
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{where_clause}
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ORDER BY er.received_ts {order}
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LIMIT ?
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OFFSET ?
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cer.canonical_alias,
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cer.name
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FROM considered_event_reports AS cer
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LEFT JOIN events ON events.event_id = cer.event_id
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""".format(
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where_clause=where_clause,
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order=order,
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