Rok Mihevc created ARROW-12301:
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Summary: [C++][Compute] Use generic hash-aggregate for
DictionaryArrays
Key: ARROW-12301
URL: https://issues.apache.org/jira/browse/ARROW-12301
Project: Apache Arrow
Issue Type: Improvement
Reporter: Rok Mihevc
When calculating unique for chunked DictionaryArrays we currently run through
all chunks and unify their dictionaries and then collect chunk indices. We
could avoid the dictionary unification by using a generic hash.
[See discussion here.|https://github.com/apache/arrow/pull/9683]
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