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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