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ARROW-2665: [C++][Python] Add index() kernel - #10358

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ARROW-2665: [C++][Python] Add index() kernel#10358
lidavidm wants to merge 5 commits into
apache:masterfrom
lidavidm:arrow-2665

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@lidavidm

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Add a simple index() kernel.

Note that the Python start/end options are handled entirely in Python, not in the kernel itself.

Short-circuiting is somewhat implemented: the kernel executor will still loop through all batches but the kernel will stop looking at data once it finds an item.

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Comment thread cpp/src/arrow/compute/kernels/aggregate_basic.cc Outdated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

@cyb70289 cyb70289 left a comment

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+1.

CI errors looks not related.

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