#27676: MariaDB 10.2 supports defaults for text columns
-------------------------------------+-------------------------------------
Reporter: Adam Johnson | Owner: Adam
| Johnson
Type: New feature | Status: closed
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution: fixed
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Tobias Krönke):
Could we skip the default if it's the empty string for MySQL? Explicitly
setting the empty string prevents the `ALGORITHM=INSTANT` magic from
adding the column without table copying. This would be a huge performance
improvement for many users. I have seen so many issues where people would
like to add new columns to very large tables efficiently. MySQL has this
now built-in, but django prevents it by redudantly specifying the empty
string as default. This is enough and makes the instant algorithm work:
{{{
ALTER TABLE `<table name>` ADD COLUMN `<column name>` longtext NOT NULL;
}}}
Same for CHAR and VARCHAR.
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Ticket URL: <https://code.djangoproject.com/ticket/27676#comment:8>
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