fn maybe_remove_builtin_columns()

in src/columnar_storage/src/read.rs [251:260]


    fn maybe_remove_builtin_columns(&self, batch: &mut RecordBatch) {
        if self.keep_builtin {
            return;
        }

        // builtin columns are always at the end.
        for _ in 0..BUILTIN_COLUMN_NUM {
            batch.remove_column(batch.num_columns() - 1);
        }
    }