code: def test_group_by_wildcard() -> None:
      df = pl.DataFrame(
          {
              "a": [1, 2],
              "b": [1, 2],
          }
      )
      assert df.group_by([pl.col("*")], maintain_order=True).agg(
          [pl.col("a").first().name.suffix("_agg")]
      ).to_dict(as_series=False) == {
          "a": [1, 2],
          "b": [1, 2],
          "a_agg": [1, 2],
      }
  
imports: from __future__ import annotations
  from collections import OrderedDict
  from datetime import datetime, timedelta
  from typing import Any
  import pytest
  import polars
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 19 for calling a global function with example usage: test_group_by_wildcard() without return types