Fabien Pinckaers
1569100baa
Opening journal items does a query similar to
```sql
SELECT
"account_move_line".id
FROM "account_move_line"
LEFT JOIN "account_move" AS "account_move_linemove_id" ON ("account_move_line"."move_id" = "account_move_linemove_id"."id")
WHERE
ORDER BY "account_move_line"."date" DESC,"account_move_line"."move_name" DESC,"account_move_line"."id" ,"account_move_line"."id" LIMIT 80
```
Indexes on `date` weren't used in such queries. Building a compound index that includes
`id` changes the index cost computation, and allows a Index Only Scal. So, it does not
have to jump on data pages anymore to retrieve the ID of rows.
Without that, postgresql will use a Seq Scan. It went from 10s to 5ms in our production
database, to open the list of journal items.
Part-of: odoo/odoo#99795
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