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Queries with the combination of account_id, id, and visibility can be categorized in three types: 1. Querying for public and unlisted to enumerate statuses visible to anyone. 2. Querying for public, unlisted, and private to enumerate statuses visible to follower. 3. Querying for direct to enumerate own direct statuses. 1 and 2 is covered by the index with condition 'visibility IN (0, 1, 2)'. It would bring better performance in case that there are many direct statuses. The index with condition 'visibility = 3' is just for 3. It would be much faster to query direct statuses thanks to this query. The total size of those two indexes are expected to be smaller than the deleted one because they are partial and does not have to cover all the table. |
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| migrate | ||
| schema.rb | ||
| seeds.rb | ||