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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