Rewrite the user_filter migration again (#6184)

you can't plausibly ALTER TABLE in sqlite, so we create the new table with the
right schema to start with.
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Richard van der Hoff 2019-10-10 11:28:23 +01:00 committed by GitHub
parent da815c1f69
commit 562b4e51dd
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2 changed files with 33 additions and 26 deletions

1
changelog.d/6184.misc Normal file
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Update `user_filters` table to have a unique index, and non-null columns. Thanks to @pik for contributing this.

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@ -5,42 +5,48 @@ from synapse.storage.engines import PostgresEngine
logger = logging.getLogger(__name__)
"""
This migration updates the user_filters table as follows:
- drops any (user_id, filter_id) duplicates
- makes the columns NON-NULLable
- turns the index into a UNIQUE index
"""
def run_upgrade(cur, database_engine, *args, **kwargs):
pass
def run_create(cur, database_engine, *args, **kwargs):
if isinstance(database_engine, PostgresEngine):
select_clause = """
CREATE TEMPORARY TABLE user_filters_migration AS
SELECT DISTINCT ON (user_id, filter_id) user_id, filter_id, filter_json
FROM user_filters;
FROM user_filters
"""
else:
select_clause = """
CREATE TEMPORARY TABLE user_filters_migration AS
SELECT * FROM user_filters GROUP BY user_id, filter_id;
SELECT * FROM user_filters GROUP BY user_id, filter_id
"""
sql = (
"""
BEGIN;
%s
DROP INDEX user_filters_by_user_id_filter_id;
DELETE FROM user_filters;
ALTER TABLE user_filters
ALTER COLUMN user_id SET NOT NULL,
ALTER COLUMN filter_id SET NOT NULL,
ALTER COLUMN filter_json SET NOT NULL;
INSERT INTO user_filters(user_id, filter_id, filter_json)
SELECT * FROM user_filters_migration;
DROP TABLE user_filters_migration;
CREATE UNIQUE INDEX user_filters_by_user_id_filter_id_unique
ON user_filters(user_id, filter_id);
END;
"""
% select_clause
sql = """
DROP TABLE IF EXISTS user_filters_migration;
DROP INDEX IF EXISTS user_filters_unique;
CREATE TABLE user_filters_migration (
user_id TEXT NOT NULL,
filter_id BIGINT NOT NULL,
filter_json BYTEA NOT NULL
);
INSERT INTO user_filters_migration (user_id, filter_id, filter_json)
%s;
CREATE UNIQUE INDEX user_filters_unique ON user_filters_migration
(user_id, filter_id);
DROP TABLE user_filters;
ALTER TABLE user_filters_migration RENAME TO user_filters;
""" % (
select_clause,
)
if isinstance(database_engine, PostgresEngine):
cur.execute(sql)
else:
cur.executescript(sql)
def run_create(cur, database_engine, *args, **kwargs):
pass