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Fix the SQL SELECT query in _paginate_room_events_txn #6340
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Doing a SELECT DISTINCT when paginating is quite expensive, because it requires the engine to do sorting on the entire events table. However, we only need to run it if we're filtering on 2+ labels, so this PR is changing the request so that DISTINCT is only used then.
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fixes #6337? |
5 tasks
Ah, yes, I missed the issue |
erikjohnston
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Nov 8, 2019
babolivier
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Sep 1, 2021
* commit '963ffb60b': Incorporate review Lint Only join on event_labels if we're filtering on labels Handle lack of filter Changelog Fix the SQL SELECT query in _paginate_room_events_txn
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Doing a SELECT DISTINCT when paginating is quite expensive, because it requires the engine to do sorting on the entire events table. However, we only need to run it if we're filtering on 2+ labels, so this PR is changing the request so that DISTINCT is only used then.
Fixes #6337