Fixed #31825 -- Made RenameField operation a noop for fields with db_column.

django/db/backends/base/schema.py

@@ -538,6 +538,8 @@ class BaseDatabaseSchemaEditor:
         If `strict` is True, raise errors if the old column does not match
         `old_field` precisely.
         """
+        if not self._field_should_be_altered(old_field, new_field):
+            return
         # Ensure this field is even column-based
         old_db_params = old_field.db_parameters(connection=self.connection)
         old_type = old_db_params['type']
@@ -1034,6 +1036,13 @@ class BaseDatabaseSchemaEditor:
             output.append(self._create_index_sql(model, [field]))
         return output
 
+    def _field_should_be_altered(self, old_field, new_field):
+        # Don't alter when changing only a field name.
+        return (
+            old_field.column != new_field.column or
+            old_field.deconstruct()[1:] != new_field.deconstruct()[1:]
+        )
+
     def _field_should_be_indexed(self, model, field):
         return field.db_index and not field.unique
 

django/db/backends/sqlite3/schema.py

@@ -99,6 +99,8 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
             super().alter_db_table(model, old_db_table, new_db_table)
 
     def alter_field(self, model, old_field, new_field, strict=False):
+        if not self._field_should_be_altered(old_field, new_field):
+            return
         old_field_name = old_field.name
         table_name = model._meta.db_table
         _, old_column_name = old_field.get_attname_column()