#36475: Optimize F-expression slice to MySQL column-prefix index
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Reporter: JaeHyuckSa | Owner: (none)
Type: | Status: closed
Cleanup/optimization |
Component: Database layer | Version: 5.1
(models, ORM) |
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Adam Johnson):
The idea is that MySQL could have a custom `_create_index_sql()` that
replaces relevant `Substr` instances with another expression that then
outputs the `col_name(length)` syntax.
Perhaps this is too complicated, and it's better to make a separate
`Prefix` expression class, though, in Django-MySQL.
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Ticket URL: <https://code.djangoproject.com/ticket/36475#comment:4>
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