[jira] [Created] (ARROW-7587) [C++][Compute] Add Top-k kernel

[Yibo Cai (Jira)]

Yibo Cai created ARROW-7587:
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             Summary: [C++][Compute] Add Top-k kernel
                 Key: ARROW-7587
                 URL: https://issues.apache.org/jira/browse/ARROW-7587
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++ - Compute
            Reporter: Yibo Cai
            Assignee: Yibo Cai


Add a kernel to get top k smallest or largest elements (indices).
std::paiital_sort should be a better solution than sorting everything then pick 
top k.



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