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  1. Apache Arrow
  2. ARROW-1900

[C++] Add kernel functions for determining value range (maximum and minimum) of integer arrays

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      These functions can be useful internally for determining when a "small range" alternative to a hash table can be used for integer arrays. The maximum and minimum is determined in a single scan.

      We already have infrastructure for aggregate kernels, so this would be an easy addition.

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              jorisvandenbossche Joris Van den Bossche
              wesm Wes McKinney
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