[5.2.x] Refs #34975 -- Removed unnecessary lookups.In.get_refs().

Now that In.get_source_expression() includes its right-hand-side when it
contains expressions (refs #36025) it no longer requires a specialized
get_refs() method.

Backport of 0bac41fc7e4a842e8d20319cba31cc645501c245 from main.

1 files changed, 0 insertions, 8 deletions

diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index df8eb1f465..2d80385fde 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -514,14 +514,6 @@ class IntegerLessThanOrEqual(IntegerFieldOverflow, LessThanOrEqual):
 class In(FieldGetDbPrepValueIterableMixin, BuiltinLookup):
     lookup_name = "in"
 
-    def get_refs(self):
-        refs = super().get_refs()
-        if self.rhs_is_direct_value():
-            for rhs in self.rhs:
-                if get_rhs_refs := getattr(rhs, "get_refs", None):
-                    refs |= get_rhs_refs()
-        return refs
-
     def get_prep_lookup(self):
         from django.db.models.sql.query import Query  # avoid circular import