From d25c20ccbe0f10fe5d6c0cef2156db7e8d76049c Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Wed, 7 Sep 2016 14:22:22 +0100 Subject: [PATCH] Use windowing function to make use of index --- synapse/storage/state.py | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/synapse/storage/state.py b/synapse/storage/state.py index 0730399b8..26ecad590 100644 --- a/synapse/storage/state.py +++ b/synapse/storage/state.py @@ -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,)