Add `event_stream_ordering` column to membership state tables (#14979)

This adds an `event_stream_ordering` column to `current_state_events`,
`local_current_membership` and `room_memberships`. Each of these tables
is regularly joined with the `events` table to get the stream ordering
and denormalising this into each table will yield significant query
performance improvements once used. Includes a background job to
populate these values from the `events` table.

Same idea as https://github.com/matrix-org/synapse/pull/13703.

Signed off by Nick @ Beeper (@fizzadar).

1 files changed, 21 insertions, 0 deletions

diff --git a/synapse/storage/schema/main/delta/73/26membership_tables_event_stream_ordering.sql b/synapse/storage/schema/main/delta/73/26membership_tables_event_stream_ordering.sql
new file mode 100644

index 0000000000..7c30a67fc4
--- /dev/null
+++ b/synapse/storage/schema/main/delta/73/26membership_tables_event_stream_ordering.sql
@@ -0,0 +1,21 @@
+/* Copyright 2022 Beeper
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+ALTER TABLE current_state_events ADD COLUMN event_stream_ordering BIGINT;
+ALTER TABLE local_current_membership ADD COLUMN event_stream_ordering BIGINT;
+ALTER TABLE room_memberships ADD COLUMN event_stream_ordering BIGINT;
+
+INSERT INTO background_updates (update_name, progress_json) VALUES
+  ('populate_membership_event_stream_ordering', '{}');