[Django] #33507: Use native UUID data type on MariaDB 10.7+

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Feb 10, 2022, 3:48:27 AM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------
Reporter: Mariusz | Owner: nobody
Felisiak |
Type: New | Status: new
feature |
Component: Database | Version: 4.0
layer (models, ORM) |
Severity: Normal | Keywords: mariadb
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
MariaDB 10.7 introduces `UUID` data type, see [https://mariadb.com/kb/en
/uuid-data-type/ docs] and [https://mariadb.org/10-7-preview-feature-uuid-
data-type/ blog post]. We should corrected the `has_native_uuid_field`
feature flag and use it instead of `char(32)`.

--
Ticket URL: <https://code.djangoproject.com/ticket/33507>
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Feb 10, 2022, 4:32:53 AM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Description changed by Mariusz Felisiak:

Old description:

> MariaDB 10.7 introduces `UUID` data type, see [https://mariadb.com/kb/en
> /uuid-data-type/ docs] and [https://mariadb.org/10-7-preview-feature-

> uuid-data-type/ blog post]. We should corrected the

> `has_native_uuid_field` feature flag and use it instead of `char(32)`.

New description:

MariaDB 10.7 introduces `UUID` data type, see [https://mariadb.com/kb/en
/uuid-data-type/ docs] and [https://mariadb.org/10-7-preview-feature-uuid-
data-type/ blog post]. We should corrected the `has_native_uuid_field`

feature flag and use `uuid` instead of `char(32)`.

--

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:1>

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Feb 10, 2022, 5:49:13 AM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Keywords: mariadb | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Carlton Gibson):

* stage: Unreviewed => Accepted

Old description:

> MariaDB 10.7 introduces `UUID` data type, see [https://mariadb.com/kb/en
> /uuid-data-type/ docs] and [https://mariadb.org/10-7-preview-feature-

> uuid-data-type/ blog post]. We should corrected the
> `has_native_uuid_field` feature flag and use `uuid` instead of
> `char(32)`.

New description:

MariaDB 10.7 introduces `UUID` data type, see [https://mariadb.com/kb/en
/uuid-data-type/ docs] and [https://mariadb.org/10-7-preview-feature-uuid-

data-type/ blog post]. We should correct the `has_native_uuid_field`
feature flag and use `uuid` instead of `char(32)`.

--

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:2>

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Feb 10, 2022, 10:21:07 AM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

Small note that we should make sure that changing this flag won't break
installs with `UUIDField` backend by `char(32)` columns as it might be
impractical for large installs to rebuild their whole table primary keys
otherwise.

If we don't document a clear upgrade path I foresee a few reports when
users attempt to add a `ForeignKey` referencing a model with a `UUIDField`
primary key that is backend by a `char(32)` and hit a MariaDB error
telling them that a foreign constraint cannot be created from a `uuid` to
a `char(32)` column.

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:3>

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Feb 10, 2022, 2:34:19 PM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Mariusz Felisiak):

Replying to [comment:3 Simon Charette]:

> Small note that we should make sure that changing this flag won't break
installs with `UUIDField` backend by `char(32)` columns as it might be
impractical for large installs to rebuild their whole table primary keys
otherwise.
>
> If we don't document a clear upgrade path I foresee a few reports when
users attempt to add a `ForeignKey` referencing a model with a `UUIDField`

primary key that is backed by a `char(32)` and hit a MariaDB error telling

them that a foreign constraint cannot be created from a `uuid` to a
`char(32)` column.

According to the [https://mariadb.org/10-7-preview-feature-uuid-data-type/
blog post], it should be possible to change a data type without manual
data conversion:

> ''With these basic conversion rules, you can migrate from your existing
CHAR/VARCHAR/TEXT hexadecimal text or BINARY/VARBINARY/BLOB encoded to
UUID using:''
> {{{
> CREATE TABLE t1 (id BINARY(16));
> ALTER TABLE t1 MODIFY COLUMN id UUID;
> }}}

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Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:4>

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Feb 10, 2022, 3:21:06 PM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Adam Johnson):

That `ALTER TABLE` still requires a table rebuild, which is impractical or
impossible for large installations’ PK's. But maybe the "upgrade path"
there would be "create a field subclass always backed by `char(32)`".

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:5>

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Feb 10, 2022, 4:09:07 PM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

> With these basic conversion rules, you can migrate from your existing
CHAR/VARCHAR/TEXT hexadecimal text or BINARY/VARBINARY/BLOB encoded to
UUID using:

Unfortunately, this statement doesn't account for the fact that UUIDs are
often used as primary keys and thus referenced by other tables where this
approach simply won't work as you get in a chicken-egg problem with
foreign references. To perform this properly a manual dropping of
references, followed by type alterations of all tables involved, and final
step to recreate constraints is required which possibly will require table
rebuilds as Adam pointed out.

> But maybe the "upgrade path" there would be "create a field subclass
always backed by char(32)".

That seems like the most suitable upgrade path. It will likely require
documenting that all the generated migration operations should be wrapped
in `SeparateDatabaseAndState` unless we adapt the schema editor to avoid
`ALTER` when the generated SQL column of `from_field` and `to_field`
remains the same.

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Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:6>

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Feb 10, 2022, 5:17:14 PM2/10/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Adam Johnson):

> unless we adapt the schema editor to avoid `ALTER` when the generated
SQL column of `from_field` and `to_field` remains the same.

This sounds like generally a good idea any way!

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:7>

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Feb 11, 2022, 12:10:39 AM2/11/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Mariusz Felisiak):

Agreed, this can be tricky. I'd really like to come up with a doable
pattern that could be used in the future, because other emulated fields
may be implemented in the databases.

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Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:8>

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Mar 14, 2022, 4:10:35 AM3/14/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Reporter: Mariusz Felisiak | Owner: Mohammad
| Ali Mehdizadeh
Type: New feature | Status: assigned

Component: Database layer | Version: 4.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: mariadb | Triage Stage: Accepted

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mohammad Ali Mehdizadeh):

* owner: nobody => Mohammad Ali Mehdizadeh
* status: new => assigned

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:9>

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Apr 1, 2022, 3:32:46 AM4/1/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Reporter: Mariusz Felisiak | Owner: (none)

Type: New feature | Status: new

Component: Database layer | Version: 4.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: mariadb | Triage Stage: Accepted

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mohammad Ali Mehdizadeh):

* owner: Mohammad Ali Mehdizadeh => (none)
* status: assigned => new

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:10>

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Apr 21, 2022, 4:48:22 AM4/21/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Reporter: Mariusz Felisiak | Owner: raydeal

Type: New feature | Status: assigned

Component: Database layer | Version: 4.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: mariadb | Triage Stage: Accepted

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by raydeal):

* owner: nobody => raydeal

* status: new => assigned

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:9>

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May 1, 2022, 12:05:43 PM5/1/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by raydeal):

MariaDB 10.7 seems to be a short-term maintenance release
https://mariadb.org/about/#maintenance-policy, and django 4.1 still
supports version 10.3

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Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:10>

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Oct 19, 2022, 10:00:54 AM10/19/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by raydeal):

* has_patch: 0 => 1

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:11>

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Oct 24, 2022, 5:05:35 AM10/24/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1

Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mariusz Felisiak):

* needs_better_patch: 0 => 1

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:12>

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Nov 26, 2022, 1:53:39 PM11/26/22

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by raydeal):

* needs_better_patch: 1 => 0

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:13>

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Mariusz Felisiak):

Replying to [comment:7 Adam Johnson]:

> > unless we adapt the schema editor to avoid `ALTER` when the generated
SQL column of `from_field` and `to_field` remains the same.
>
> This sounds like generally a good idea any way!

Looks like it already
[https://github.com/django/django/blob/05d70fb92b72f9701bea99c809a5edd53b290de9/django/db/backends/base/schema.py#L961-L966
works]. For example, I've changed `models.CharField(max_length=50,
unique=True)` to `models.SlugField(unique=True)` on PostgreSQL and Django
didn't alter the db type:
{{{#!sql
--
-- Alter field field_2 on mytestmodel
--
-- (no-op)
}}}

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:14>

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Feb 28, 2023, 3:58:08 AM2/28/23

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 1

Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mariusz Felisiak):

* needs_better_patch: 0 => 1

* needs_docs: 0 => 1

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:15>

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by raydeal):

* needs_better_patch: 1 => 0

* needs_docs: 1 => 0

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:16>

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1

Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mariusz Felisiak):

* needs_better_patch: 0 => 1

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:17>

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by raydeal):

* needs_better_patch: 1 => 0

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:18>

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Keywords: mariadb | Triage Stage: Ready for
| checkin
Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mariusz Felisiak):

* stage: Accepted => Ready for checkin

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:19>

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Reporter: Mariusz Felisiak | Owner: raydeal

Type: New feature | Status: closed

Component: Database layer | Version: 4.0
(models, ORM) |

Severity: Normal | Resolution: fixed

Keywords: mariadb | Triage Stage: Ready for
| checkin

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Mariusz Felisiak <felisiak.mariusz@…>):

* status: assigned => closed
* resolution: => fixed

Comment:

In [changeset:"7cd187a5ba58d7769039f487faeb9a5a2ff05540" 7cd187a]:
{{{
#!CommitTicketReference repository=""
revision="7cd187a5ba58d7769039f487faeb9a5a2ff05540"
Fixed #33507 -- Used UUID data type on MariaDB 10.7+.

Co-Authored-By: Mariusz Felisiak <felisiak...@gmail.com>
}}}

--
Ticket URL: <https://code.djangoproject.com/ticket/33507#comment:20>

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Aug 25, 2023, 5:24:31 AM8/25/23

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#33507: Use native UUID data type on MariaDB 10.7+
-------------------------------------+-------------------------------------

Has patch: 1 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by GitHub <noreply@…>):

In [changeset:"9c37103a98d030be110eb9ba8b7ed32a47240b28" 9c37103]:
{{{
#!CommitTicketReference repository=""
revision="9c37103a98d030be110eb9ba8b7ed32a47240b28"
Refs #33507 -- Doc'd using UUID data type on MariaDB 10.7+ in UUIDField
docs.