mirror of https://github.com/zulip/zulip.git
100 lines
3.2 KiB
Python
100 lines
3.2 KiB
Python
from __future__ import absolute_import
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from __future__ import print_function
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from typing import Any, Callable, Dict, List, Set, Text
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from django.db import connection
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from zerver.lib.management import ZulipBaseCommand
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def create_index_if_not_exist(index_name, table_name, column_string, where_clause):
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# type: (Text, Text, Text, Text) -> None
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#
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# This function is somewhat similar to
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# zerver.lib.migrate.create_index_if_not_exist.
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#
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# The other function gets used as part of Django migrations; this function
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# uses SQL that is not supported by Django migrations.
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#
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# Creating concurrent indexes is kind of a pain with current versions
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# of Django/postgres, because you will get this error with seemingly
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# reasonable code:
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#
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# CREATE INDEX CONCURRENTLY cannot be executed from a function or multi-command string
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#
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# For a lot more detail on this process, refer to the commit message
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# that added this file to the repo.
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with connection.cursor() as cursor:
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sql = '''
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SELECT 1
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FROM pg_class
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where relname = %s
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'''
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cursor.execute(sql, [index_name])
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rows = cursor.fetchall()
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if len(rows) > 0:
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print('Index %s already exists.' % (index_name,))
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return
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print("Creating index %s." % (index_name,))
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sql = '''
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CREATE INDEX CONCURRENTLY
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%s
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ON %s (%s)
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%s;
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''' % (index_name, table_name, column_string, where_clause)
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cursor.execute(sql)
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print('Finished creating %s.' % (index_name,))
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def create_indexes():
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# type: () -> None
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# copied from 0082
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create_index_if_not_exist(
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index_name='zerver_usermessage_starred_message_id',
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table_name='zerver_usermessage',
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column_string='user_profile_id, message_id',
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where_clause='WHERE (flags & 2) != 0',
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)
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# copied from 0083
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create_index_if_not_exist(
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index_name='zerver_usermessage_mentioned_message_id',
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table_name='zerver_usermessage',
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column_string='user_profile_id, message_id',
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where_clause='WHERE (flags & 8) != 0',
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)
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# copied from 0095
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create_index_if_not_exist(
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index_name='zerver_usermessage_unread_message_id',
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table_name='zerver_usermessage',
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column_string='user_profile_id, message_id',
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where_clause='WHERE (flags & 1) = 0',
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)
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# copied from 0098
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create_index_if_not_exist(
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index_name='zerver_usermessage_has_alert_word_message_id',
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table_name='zerver_usermessage',
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column_string='user_profile_id, message_id',
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where_clause='WHERE (flags & 512) != 0',
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)
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# copied from 0099
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create_index_if_not_exist(
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index_name='zerver_usermessage_wildcard_mentioned_message_id',
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table_name='zerver_usermessage',
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column_string='user_profile_id, message_id',
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where_clause='WHERE (flags & 8) != 0 OR (flags & 16) != 0',
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)
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class Command(ZulipBaseCommand):
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help = """Create concurrent indexes for large tables."""
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def handle(self, *args, **options):
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# type: (*Any, **str) -> None
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create_indexes()
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