[jira] [Created] (ARROW-13682) [C++] Add TDigest::Merge(const TDigest&)

[David Li (Jira)]

David Li created ARROW-13682:
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             Summary: [C++] Add TDigest::Merge(const TDigest&)
                 Key: ARROW-13682
                 URL: https://issues.apache.org/jira/browse/ARROW-13682
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: David Li
            Assignee: Yibo Cai
             Fix For: 6.0.0


Currently it's inconvenient to merge a single TDigest, but this is useful in 
contexts like the aggregate kernels. Follow-up from ARROW-13520.



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