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  1. Apache Arrow
  2. ARROW-15152

[C++] Implement a `hash_list` aggregate function

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      For more advanced aggregations, it's helpful to be able to gather the grouped values into a list array. Pandas and Polars both have that feature. And `hash_distinct` already aggregates to lists, so all the building blocks are there.

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            dhruv9vats Dhruv Vats
            coady A. Coady
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