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ARROW-9056: [C++] Support aggregations over scalars - #10725

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lidavidm:arrow-9056
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ARROW-9056: [C++] Support aggregations over scalars#10725
lidavidm wants to merge 10 commits into
apache:masterfrom
lidavidm:arrow-9056

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@lidavidm

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This adds various trivial implementations to support scalar aggregations over scalar inputs, for all kernels except index.

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@nealrichardson nealrichardson left a comment

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There are a couple of skipped tests for this in the R package, could you remove the skips? (Just search for "ARROW-9056")

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Thanks for doing this!
Two high level comments:

Comment thread cpp/src/arrow/compute/kernels/aggregate_basic.cc Outdated
Comment thread cpp/src/arrow/compute/kernels/aggregate_basic.cc Outdated
Comment thread cpp/src/arrow/compute/kernels/aggregate_basic_internal.h Outdated
Comment thread cpp/src/arrow/compute/kernels/aggregate_basic_internal.h Outdated
Comment thread cpp/src/arrow/compute/kernels/aggregate_basic_internal.h Outdated

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LGTM

@lidavidm

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Fixed the MSVC failure + rebased.

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