47657c988e
The "keyset"-style pagination that Tildes uses for topic listings uses WHERE and ORDER BY clauses that involve multiple columns to keep a deterministic ordering even when the values in the main sort column are equal. For example, when sorting by number of votes, you're actually ordering by num_votes DESC, topic_id DESC. The previous single-column indexes were a little inefficient for this and couldn't always be used well. This commit extends all of the relevant indexes to composite ones that contain topic_id as well, and drops all of the original ones. This should be more efficient, and should probably be done to indexes on the comments table as well.
Tildes
This is the code behind Tildes, a non-profit community site. The official repository is located on GitLab at https://gitlab.com/tildes/tildes
For general information about Tildes and its goals, please see the announcement blog post and the Tildes Docs site.
Issue tracker / plans
Known issues and plans for upcoming changes are tracked on GitLab: https://gitlab.com/tildes/tildes/issues
The "board" view is useful as an overview: https://gitlab.com/tildes/tildes/boards
Contributing to Tildes development
Please see the Contributing doc for more detailed information about setting up a development version of Tildes and how to contribute to development.
License
Copyright (c) 2018 Tildes contributors code@tildes.net
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.