code: def test_arr_unique() -> None:
      df = pl.DataFrame(
          {
              "a": pl.Series(
                  "a", [[1, 1], [4, 3]], dtype=pl.Array(pl.Int64, 2)
              )
          }
      )
  
      out = df.select(pl.col("a").arr.unique(maintain_order=True))
      expected = pl.DataFrame({"a": [[1], [4, 3]]})
      assert_frame_equal(out, expected)
  
file_path: polars/py-polars/tests/unit/namespaces/array/test_array.py
imports: import numpy
  import pytest
  import polars
  from polars import ComputeError
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 4 for calling a global function with example usage: test_arr_unique() without return types