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  1. Apache Arrow
  2. ARROW-13764

[C++] Implement ScalarAggregateOptions for count_distinct (grouped)

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      I'm writing the R bindings for the grouped count_distinct kernel, but the current implementation counts nulls as their own group. To match the R behaviour, I need to be able to specify whether or not to remove NA/NULL values.

      Please could we have ScalarAggregateOptions implemented for count_distinct?

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              lidavidm David Li
              thisisnic Nicola Crane
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