id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
33626	django.db.models.query_utils.RegisterLookupMixin._unregister_lookup method also should clear the cache stored for django.db.models.query_utils.RegisterLookupMixin.get_lookups	Himanshu Balasamanta	Himanshu Balasamanta	"Hi Carlton. 
I have opened the PR https://github.com/django/django/pull/15569, and have also modified the test that was supposed to throw error(schema.tests.SchemaTests.test_func_unique_constraint_lookups). 

There is no test that checks if the lookup stays in cache after unregistering it. In my PR, I have added an assert statement to check it in **custom_lookups.tests.LookupTests.test_lookups_caching** test. Running the test without clearing cache from _unregister_lookup will fail.

The cache stays between tests, so you are likely to get different results running tests independently and running all tests in a module. (PS: I faced this problem earlier running tests individually and together gave different results.)"	Bug	assigned	Error reporting	4.0	Normal		Lookups, caching, ORM	Carlton Gibson	Unreviewed	0	0	0	0	0	0