Refs #24020 -- Removed redundant Query.get_loaded_field_names().

get_loaded_field_names() is no longer called in multiple places
(see 0c7633178f) and it's redundant
with SQLCompiler.deferred_to_columns().

django/db/models/sql/compiler.py

@@ -1006,7 +1006,7 @@ class SQLCompiler:
         if not opts:
             opts = self.query.get_meta()
             root_alias = self.query.get_initial_alias()
-        only_load = self.query.get_loaded_field_names()
+        only_load = self.deferred_to_columns()
 
         # Setup for the case when only particular related fields should be
         # included in the related selection.

django/db/models/sql/query.py

@@ -2341,25 +2341,6 @@ class Query(BaseExpression):
             # Replace any existing "immediate load" field names.
             self.deferred_loading = frozenset(field_names), False
 
-    def get_loaded_field_names(self):
-        """
-        If any fields are marked to be deferred, return a dictionary mapping
-        models to a set of names in those fields that will be loaded. If a
-        model is not in the returned dictionary, none of its fields are
-        deferred.
-
-        If no fields are marked for deferral, return an empty dictionary.
-        """
-        # We cache this because we call this function multiple times
-        # (compiler.fill_related_selections, query.iterator)
-        try:
-            return self._loaded_field_names_cache
-        except AttributeError:
-            collection = {}
-            self.deferred_to_data(collection, self.get_loaded_field_names_cb)
-            self._loaded_field_names_cache = collection
-            return collection
-
     def get_loaded_field_names_cb(self, target, model, fields):
         """Callback used by get_deferred_field_names()."""
         target[model] = {f.attname for f in fields}