ARROW-13737: [C++] Support for grouped aggregation over scalar columns#10994
ARROW-13737: [C++] Support for grouped aggregation over scalar columns#10994lidavidm wants to merge 6 commits intoapache:masterfrom
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It looks like most of this could be factored out to reuse in both GroupByUsingExecPlan overloads.
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Is there a reason we don't want to be explicit in our capture here?
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We may capture explicitly when lifetime is at stake, e.g. in async code where it's important to delineate what exactly needs to survive past the enclosing scope. Here, the callable is executed synchronously, listing every capture explicitly is more of a nuisance (both for typing and readability-wise).
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@felipeblazing Out of curiosity, why do you think capturing explicitly would be better here?
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can we also capture explicitly here?
pitrou
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+1 from me. @felipeblazing Feel free to review again as well.
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Also fixes a major bug in grouped var/std, where multiple batches fed to the same state instance would improperly update state.