[jira] [Created] (ARROW-14129) [C++] An empty dictionary arrow crashes on `unique` and `value_counts`.

["A. Coady (Jira)" <ji...@apache.org>]

A. Coady created ARROW-14129:
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             Summary: [C++] An empty dictionary arrow crashes on `unique` and `value_counts`.
                 Key: ARROW-14129
                 URL: https://issues.apache.org/jira/browse/ARROW-14129
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Python
    Affects Versions: 5.0.0
            Reporter: A. Coady


{code:python}
import pyarrow as pa
arr = pa.array(range(3)).dictionary_encode()
assert not arr[:0]
assert arr[:0].unique() # Check failed: (data->dictionary) != (nullptr) 
{code}




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