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  1. Apache Arrow
  2. ARROW-14003

[C++][Python] Not providing a sort_key in the "select_k_unstable" kernel crashes

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      The new kernel added in ARROW-1565 crashes in Python if you don't specify a sort_key:

      In [1]: import pyarrow.compute as pc
      
      In [2]: arr = pa.array([1, 2, 3, 4])
      
      In [3]: pc.select_k_unstable(arr, k=2)
      Segmentation fault (core dumped)
      

      cc aocsa

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              aocsa Alexander Ocsa
              jorisvandenbossche Joris Van den Bossche
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