def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
        """Prepare SQL from inner funcions (ll_to_earth or any other)"""
        c = self.copy()
        c.is_summary = summarize
        c.for_save = for_save
        for pos, expression in enumerate(self.expressions):
            c.expressions[pos] = expression.resolve_expression(query, allow_joins, reuse, summarize)
        return c