Updated `GeoSQLCompiler.get_default_columns`.

        result = []

        if opts is None:

            opts = self.query.model._meta

        # Skip all proxy to the root proxied model

        opts = opts.concrete_model._meta

        aliases = set()

        only_load = self.deferred_to_columns()

        # Skip all proxy to the root proxied model

        proxied_model = opts.concrete_model

        if start_alias:

            seen = {None: start_alias}

                try:

                    alias = seen[model]

                except KeyError:

                    if model is proxied_model:

                        alias = start_alias

                    else:

                    link_field = opts.get_ancestor_link(model)

                    alias = self.query.join((start_alias, model._meta.db_table,

                            link_field.column, model._meta.pk.column))