Uwe L. Korn created ARROW-377:
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Summary: 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
Reporter: Uwe L. Korn
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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