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Posted to issues@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2020/10/27 18:08:00 UTC

[jira] [Created] (ARROW-10403) [C++] Implement unique kernel for dictionary type

Neal Richardson created ARROW-10403:
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             Summary: [C++] Implement unique kernel for dictionary type
                 Key: ARROW-10403
                 URL: https://issues.apache.org/jira/browse/ARROW-10403
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Neal Richardson
            Assignee: Ben Kietzman


Calling the "unique" compute function on a ChunkedArray of dictionary type (as read by the CSV reader) errors with "Only hashing for data with equal dictionaries currently supported". But is it necessary to hash to get unique values from a dictionary type? The dictionary values are the unique values (for each chunk), they're already there.



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