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  1. Apache Arrow
  2. ARROW-3735

[Python] Proper error handling in _ensure_type

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    Description

      We have multiple _ensure_type like functions, the in defined in array.pxi bypasses None which causes segfault in the following example:

      pa.array([1, 2, 3]).cast(None)
      

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              uwe Uwe Korn
              kszucs Krisztian Szucs
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