rtpsw commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1116163443
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cpp/src/arrow/compute/exec.h:
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@@ -240,6 +246,8 @@ struct ARROW_EXPORT ExecBatch {
ExecBatch Slice(int64_t offset, int64_t length) const;
+ Result<ExecBatch> SelectValues(const std::vector<int>& ids) const;
Review Comment:
It is
[used](https://github.com/apache/arrow/pull/34311/files#diff-f53040e5fc284581263737f96238c8a76ef54d13f01e34305c1d1d9de5e6e34bR214)
for selecting the values (i.e., columns) of the batch that correspond to the
segment-keys. The resulting sub-batch, having just these values, is [processed
by the
segmenter](https://github.com/apache/arrow/pull/34311/files#diff-f53040e5fc284581263737f96238c8a76ef54d13f01e34305c1d1d9de5e6e34bR216).
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