mirror of
https://github.com/zulip/zulip.git
synced 2025-11-03 21:43:21 +00:00
c96d58734f
This index is basically free, since it only consumes space for messages that mention the user, but results in a massive performance improvement when querying messages that mention a user.
25 lines
721 B
Python
25 lines
721 B
Python
# -*- coding: utf-8 -*-
|
|
from __future__ import unicode_literals
|
|
|
|
from django.db import migrations
|
|
from zerver.lib.migrate import create_index_if_not_exist # nolint
|
|
|
|
|
|
class Migration(migrations.Migration):
|
|
|
|
dependencies = [
|
|
('zerver', '0082_index_starred_user_messages'),
|
|
]
|
|
|
|
operations = [
|
|
migrations.RunSQL(
|
|
create_index_if_not_exist(
|
|
index_name='zerver_usermessage_mentioned_message_id',
|
|
table_name='zerver_usermessage',
|
|
column_string='user_profile_id, message_id',
|
|
where_clause='WHERE (flags & 8) != 0',
|
|
),
|
|
reverse_sql='DROP INDEX zerver_usermessage_mentioned_message_id;'
|
|
),
|
|
]
|