/* Copyright 2020 The Matrix.org Foundation C.I.C.
 *
 * 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.
 */

-- see rooms_version_column_2.sql.postgres for details of what's going on here.

UPDATE rooms SET room_version=(
    SELECT COALESCE(json_extract(ej.json, '$.content.room_version'), '1')
    FROM current_state_events cse INNER JOIN event_json ej USING (event_id)
    WHERE cse.room_id=rooms.room_id AND cse.type='m.room.create' AND cse.state_key=''
) WHERE rooms.room_version IS NULL;