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Posted to issues@arrow.apache.org by "Torstein Sørnes (Jira)" <ji...@apache.org> on 2021/06/08 12:21:00 UTC

[jira] [Created] (ARROW-13007) Supporting Sets (HashSets)

Torstein Sørnes created ARROW-13007:
---------------------------------------

             Summary: Supporting Sets (HashSets)
                 Key: ARROW-13007
                 URL: https://issues.apache.org/jira/browse/ARROW-13007
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 4.0.1
            Reporter: Torstein Sørnes


Having support for Sets would be great.

 

It is possible to do:
```
pd.DataFrame([[\{'1': None}]], columns =["s"]).to_feather('/tmp/x')

```
But using a Set instead of a dictionary is not possible
```

pd.DataFrame([[\{'1'}]], columns =["s"]).to_feather('/tmp/x')

 

ArrowInvalid: ("Could not convert \{'1'} with type set: did not recognize Python value type when inferring an Arrow data type", 'Conversion failed for column s with type object')
```



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