Method has_composite_fields

django/db/models/sql/compiler.py:1546–1549

(self, expressions)

            yield row

    def has_composite_fields(self, expressions):
        # Check for composite fields before calling the relatively costly
        # composite_fields_to_tuples.
        return any(isinstance(expression, ColPairs) for expression in expressions)

    def composite_fields_to_tuples(self, rows, expressions):
        col_pair_slices = [