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  1. Apache Arrow
  2. ARROW-7179

[C++][Compute] Consolidate fill_null and coalesce

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      fill_null and coalesce are essentially the same kernel, except the former is binary and doesn't support an array fill value, and the latter is variadic and supports scalar and array fill values.

      We should consolidate them into one kernel, picking the faster implementation.

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              lidavidm David Li
              bkietz Ben Kietzman
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