#35369: MySQL .union().aggregate() raises Unknown Column
-------------------------------------+-------------------------------------
Reporter: DS/Charlie | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 5.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
union,aggregate,mysql | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by DS/Charlie:
Old description:
> {{{
>
> class BugModel(models.Model):
> foo = models.CharField(max_length=255)
>
> class BugTestCase(TestCase):
> def test_bug(self):
> a = BugModel.objects.all()
> b = BugModel.objects.all()
>
> ab = a.union(b)
> """
> (
> SELECT `bugapp_bugmodel`.`id` AS `col1`,
> `bugapp_bugmodel`.`foo` AS `col2`
> FROM `bugapp_bugmodel`
> ) UNION (
> SELECT `bugapp_bugmodel`.`id` AS `col1`,
> `bugapp_bugmodel`.`foo` AS `col2`
> FROM `bugapp_bugmodel`
> )
> """
>
> ab.aggregate(max=Max("foo"))
> """
> SELECT MAX(`__col1`)
> FROM (
> (
> SELECT `bugapp_bugmodel`.`id` AS `col1`,
> `bugapp_bugmodel`.`foo` AS `col2`
> FROM `bugapp_bugmodel`
> ) UNION (
> SELECT `bugapp_bugmodel`.`id` AS `col1`,
> `bugapp_bugmodel`.`foo` AS `col2`
> FROM `bugapp_bugmodel`
> )
> ) subquery
>
> Traceback (most recent call last):
> File "/private/tmp/djangobug/venv/lib/python3.12/site-
> packages/django/db/backends/utils.py", line 89, in _execute
> return self.cursor.execute(sql, params)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File "/private/tmp/djangobug/venv/lib/python3.12/site-
> packages/django/db/backends/mysql/base.py", line 75, in execute
> return self.cursor.execute(query, args)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File "/private/tmp/djangobug/venv/lib/python3.12/site-
> packages/MySQLdb/cursors.py", line 179, in execute
> res = self._query(mogrified_query)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File "/private/tmp/djangobug/venv/lib/python3.12/site-
> packages/MySQLdb/cursors.py", line 330, in _query
> db.query(q)
> File "/private/tmp/djangobug/venv/lib/python3.12/site-
> packages/MySQLdb/connections.py", line 261, in query
> _mysql.connection.query(self, query)
> MySQLdb.OperationalError: (1054, "Unknown column '__col1' in
> 'field list'")
> """
> }}}
>
> Django 4.2.11 and 5.0.4
> mysqlclient 2.2.4
>
> all in a clean virtualenv on python 3.12.2
New description:
{{{
class BugModel(models.Model):
foo = models.CharField(max_length=255)
class BugTestCase(TestCase):
def test_bug(self):
a = BugModel.objects.all()
b = BugModel.objects.all()
ab = a.union(b) # does NOT happen with `a | b`
"""
(
SELECT `bugapp_bugmodel`.`id` AS `col1`,
`bugapp_bugmodel`.`foo` AS `col2`
FROM `bugapp_bugmodel`
) UNION (
SELECT `bugapp_bugmodel`.`id` AS `col1`,
`bugapp_bugmodel`.`foo` AS `col2`
FROM `bugapp_bugmodel`
)
"""
q = ab.aggregate(max=Max("foo"))
"""
SELECT MAX(`__col1`)
FROM (
(
SELECT `bugapp_bugmodel`.`id` AS `col1`,
`bugapp_bugmodel`.`foo` AS `col2`
FROM `bugapp_bugmodel`
) UNION (
SELECT `bugapp_bugmodel`.`id` AS `col1`,
`bugapp_bugmodel`.`foo` AS `col2`
FROM `bugapp_bugmodel`
)
) subquery
Traceback (most recent call last):
File "/private/tmp/djangobug/venv/lib/python3.12/site-
packages/django/db/backends/utils.py", line 89, in _execute
return self.cursor.execute(sql, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/tmp/djangobug/venv/lib/python3.12/site-
packages/django/db/backends/mysql/base.py", line 75, in execute
return self.cursor.execute(query, args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/tmp/djangobug/venv/lib/python3.12/site-
packages/MySQLdb/cursors.py", line 179, in execute
res = self._query(mogrified_query)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/tmp/djangobug/venv/lib/python3.12/site-
packages/MySQLdb/cursors.py", line 330, in _query
db.query(q)
File "/private/tmp/djangobug/venv/lib/python3.12/site-
packages/MySQLdb/connections.py", line 261, in query
_mysql.connection.query(self, query)
MySQLdb.OperationalError: (1054, "Unknown column '__col1' in
'field list'")
"""
self.assertIsNone(q['max'])
}}}
Django 4.2.11 and 5.0.4
mysqlclient 2.2.4
all in a clean virtualenv on python 3.12.2
--
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Ticket URL: <https://code.djangoproject.com/ticket/35369#comment:3>
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