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Fixed #23576 -- Implemented multi-alias fast-path deletion in MySQL backend.

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This required moving the entirety of DELETE SQL generation to the
compiler where it should have been in the first place and implementing
a specialized compiler on MySQL/MariaDB.

The MySQL compiler relies on the "DELETE table FROM table JOIN" syntax
for queries spanning over multiple tables.
This commit is contained in:
Simon Charette 2019-10-17 01:57:39 -04:00 • committed by Mariusz Felisiak
parent e645f27907
commit 7acef095d7
5 changed files with 54 additions and 49 deletions
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4
tests/delete/tests.py
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@ -535,9 +535,7 @@ class FastDeleteTests(TestCase):
a = Avatar.objects.create(desc='a')
User.objects.create(avatar=a)
u2 = User.objects.create()
expected_queries = 1 if connection.features.update_can_self_select else 2
self.assertNumQueries(expected_queries,
User.objects.filter(avatar__desc='a').delete)
self.assertNumQueries(1, User.objects.filter(avatar__desc='a').delete)
self.assertEqual(User.objects.count(), 1)
self.assertTrue(User.objects.filter(pk=u2.pk).exists())