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https://issues.apache.org/jira/browse/ARROW-377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rok Mihevc updated ARROW-377:
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External issue URL: https://github.com/apache/arrow/issues/15950
> Python: Add support for conversion of Pandas.Categorical
> --------------------------------------------------------
>
> Key: ARROW-377
> URL: https://issues.apache.org/jira/browse/ARROW-377
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Python
> Reporter: Uwe Korn
> Assignee: Wes McKinney
> Priority: Minor
> Labels: newbie
> Fix For: 0.2.0
>
>
> At the moment conversion from {{pandas.Categorical}} columns fails with
> {{ArrowException: Invalid: only handle 1-dimensional arrays}}. As a better
> alternative, we should provide one of the following solutions:
> * Convert the categorical column to a string (Pandas type {{object}})
> column, then use the conversion routines for strings. Add some metadata to
> the Arrow column that it was initially a Pandas string column so that in the
> case of a roundtrip, it will be a categorical column again.
> * Implement the conversion of the column to a dictionary-encoded Arrow
> column. This is the preferred solution but may be more complicated to
> implement as certain requirements have not yet been implemented.
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