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David LiBenjamin Kietzman
6231647ad42
David Li authored and Benjamin Kietzman committed b831359d8be
ARROW-12728: [C++] Implement count_distinct/distinct hash aggregate kernels

This reuses the Grouper to add kernels for count_distinct and distinct. The implementation for distinct is very simple and not particularly efficient, leveraging Concatenate to build the output list. Neither kernel handles larger-than-memory processing.

Closes #10876 from lidavidm/arrow-12728

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>