[jira] [Created] (ARROW-2128) [Python] Cannot serialize array of empty lists

[Uwe L. Korn (JIRA)]

Uwe L. Korn created ARROW-2128:
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             Summary: [Python] Cannot serialize array of empty lists
                 Key: ARROW-2128
                 URL: https://issues.apache.org/jira/browse/ARROW-2128
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.8.0
            Reporter: Uwe L. Korn
             Fix For: 0.9.0


This currently failing:
{code:java}
data = pd.Series([[], [], []])
arr = pa.array(data)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
array.pxi:181: in pyarrow.lib.array
???
array.pxi:26: in pyarrow.lib._sequence_to_array
???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

> ???
E pyarrow.lib.ArrowTypeError: Unable to determine data type

{code}
The code in {{SeqVisitor::GetType}} suggests that we don't want to support thus 
but I would have expected that the above should result in {{List<Null>}}.



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