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Posted to jira@arrow.apache.org by "Torstein Sørnes (Jira)" <ji...@apache.org> on 2021/06/08 12:22:00 UTC

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

     [ https://issues.apache.org/jira/browse/ARROW-13007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Torstein Sørnes updated ARROW-13007:
------------------------------------
    Description: 
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')}}

  was:
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')
```


> 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
>            Priority: Major
>
> 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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