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Use windowing function to make use of index

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This commit is contained in:
Erik Johnston 2016-09-07 14:22:22 +01:00
parent 94a83b534f
commit d25c20ccbe
1 changed files with 5 additions and 5 deletions
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10
synapse/storage/state.py
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@ -322,11 +322,11 @@ class StateStore(SQLBaseStore):
SELECT prev_state_group FROM state_group_edges e, state s
WHERE s.state_group = e.state_group
)
SELECT type, state_key, event_id FROM state_groups_state
WHERE ROW(type, state_key, state_group) IN (
SELECT type, state_key, max(state_group) FROM state
INNER JOIN state_groups_state USING (state_group)
GROUP BY type, state_key
SELECT type, state_key, last_value(event_id) OVER (
PARTITION BY type, state_key ORDER BY state_group ASC
) AS event_id FROM state_groups_state
WHERE state_group IN (
SELECT state_group FROM state
)
%s;
""") % (where_clause,)