Wes McKinney created ARROW-5335:
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             Summary: [Python] Support for converting variable dictionaries to 
pandas
                 Key: ARROW-5335
                 URL: https://issues.apache.org/jira/browse/ARROW-5335
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Wes McKinney
             Fix For: 0.14.0


Address after ARROW-3144. The current code presumes the dictionary is the same 
for all chunks. We should check if the dictionary is the same for all chunks, 
and if not, perform a {{DictionaryType::Unify}} operation and then write out 
into the resulting {{CategoricalBlock}}



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