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https://issues.apache.org/jira/browse/ARROW-2443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16441083#comment-16441083
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ASF GitHub Bot commented on ARROW-2443:
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xhochy opened a new pull request #1906: ARROW-2443: [Python] Allow creation of
empty Dictionary indices
URL: https://github.com/apache/arrow/pull/1906
Empty dictionaries are a valid use case if you have absolutely no data in an
array. This was working pre-0.9.0 releases of Arrow.
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> [Python] Conversion from pandas of empty categorical fails with ArrowInvalid
> ----------------------------------------------------------------------------
>
> Key: ARROW-2443
> URL: https://issues.apache.org/jira/browse/ARROW-2443
> Project: Apache Arrow
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Florian Jetter
> Assignee: Uwe L. Korn
> Priority: Minor
> Labels: pull-request-available
> Fix For: 0.10.0
>
>
> The conversion of an empty pandas categorical raises an exception. Before
> version `0.9.0` this was possible
> {code:java}
> import pandas as pd
> import pyarrow as pa
> pa.Table.from_pandas(pd.DataFrame({'cat': pd.Categorical([])})){code}
> raises:
> {{ArrowInvalid: Dictionary indices must have non-zero length}}
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