#27441: MySQL backend output for 'DROP COLUMN' uses undocumented SQL
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Reporter: Adam Chainz | Owner: nobody
Type: Cleanup/optimization | Status: new
Component: Migrations | Version: 1.10
Severity: Normal | 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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Django's default SchemaEditor outputs `DROP COLUMN ... CASCADE`. When
inspecting the SQL for a migration I saw this and wondered what the
`CASCADE` means - it's not documented on MySQL (
http://dev.mysql.com/doc/refman/5.7/en/alter-table.html ), but I
discovered it is a no-op added for compatibility with e.g. postgres where
it does mean something. I added this to the MariaDB documentation (
https://mariadb.com/kb/en/mariadb/alter-table/ ) because it's editable,
but it's not going to get added to the MySQL documentation any time soon.
Since it's potentially confusing and a no-op, I think Django shouldn't
output `CASCADE` on MySQL.
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Ticket URL: <https://code.djangoproject.com/ticket/27441>
Django <https://code.djangoproject.com/>
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