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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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ASF GitHub Bot updated ARROW-14129:
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Labels: pull-request-available (was: )
> [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
> Assignee: David Li
> Priority: Critical
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {code:python}
> import pyarrow as pa
> arr = pa.array(range(3)).dictionary_encode()
> assert not arr[:0]
> arr[:0].unique() # Check failed: (data->dictionary) != (nullptr)
> {code}
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