code: def test_concat_horizontal(lazy: bool) -> None:
      a = pl.DataFrame({"a": ["a", "b"], "b": [1, 2]})
      b = pl.DataFrame(
          {"c": [5, 7, 8, 9], "d": [1, 2, 1, 2], "e": [1, 2, 1, 2]}
      )
  
      if lazy:
          out = pl.concat(
              [a.lazy(), b.lazy()], how="horizontal"
          ).collect()
      else:
          out = pl.concat([a, b], how="horizontal")
  
      expected = pl.DataFrame(
          {
              "a": ["a", "b", None, None],
              "b": [1, 2, None, None],
              "c": [5, 7, 8, 9],
              "d": [1, 2, 1, 2],
              "e": [1, 2, 1, 2],
          }
      )
      assert_frame_equal(out, expected)
  
imports: from __future__ import annotations
  from datetime import timedelta
  from typing import TYPE_CHECKING
  import numpy
  import pytest
  import polars
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 3 for calling a global function with example usage: test_concat_horizontal(lazy) without return types