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https://issues.apache.org/jira/browse/ARROW-14129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A. Coady updated ARROW-14129:
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Summary: [C++] An empty dictionary array crashes on `unique` and
`value_counts`. (was: [C++] An empty dictionary arrow crashes on `unique` and
`value_counts`.)
> [C++] An empty dictionary array 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
> Priority: Critical
>
> {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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