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Diffstat (limited to '')
| -rw-r--r-- | synapse/storage/stream.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py index 3516636dd1..862c5c3ea1 100644 --- a/synapse/storage/stream.py +++ b/synapse/storage/stream.py @@ -96,6 +96,10 @@ def upper_bound(token, engine, inclusive=True): def filter_to_clause(event_filter): + # NB: This may create SQL clauses that don't optimise well (and we don't + # have indices on all possible clauses). E.g. it may create + # "room_id == X AND room_id != X", which postgres doesn't optimise. + if not event_filter: return "", [] |