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[C++][Compute] GroupBy: support more than 2^32 groups #28469

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Description

@asfimport

Support:
a) 64-bit hash,
b) 64-bit group id and
c) 64-bit hash table key offsets
in hash group by.

Reporter: Michal Nowakiewicz / @michalursa

Related issues:

Note: This issue was originally created as ARROW-12727. Please see the migration documentation for further details.

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