[jira] [Resolved] (ARROW-2443) [Python] Conversion from pandas of empty categorical fails with ArrowInvalid

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-2443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou resolved ARROW-2443.
-----------------------------------
    Resolution: Fixed

Issue resolved by pull request 1906
[https://github.com/apache/arrow/pull/1906]

> [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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