[jira] [Created] (ARROW-1584) [PYTHON] serialize_pandas on empty dataframe

["Tom Augspurger (JIRA)" <ji...@apache.org>]

Tom Augspurger created ARROW-1584:
-------------------------------------

             Summary: [PYTHON] serialize_pandas on empty dataframe
                 Key: ARROW-1584
                 URL: https://issues.apache.org/jira/browse/ARROW-1584
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.7.0
            Reporter: Tom Augspurger
            Priority: Minor
             Fix For: 0.8.0


This code

{code:python}
import pandas as pd
import pyarrow as pa

pa.serialize_pandas(pd.DataFrame())
{code}

Raises

{code}
---------------------------------------------------------------------------
ArrowNotImplementedError                  Traceback (most recent call last)
<ipython-input-71-ad21add45f0d> in <module>()
----> 1 pa.serialize_pandas(pd.DataFrame())

~/Envs/dask-dev/lib/python3.6/site-packages/pyarrow/ipc.py in serialize_pandas(df)
    158     sink = pa.BufferOutputStream()
    159     writer = pa.RecordBatchStreamWriter(sink, batch.schema)
--> 160     writer.write_batch(batch)
    161     writer.close()
    162     return sink.get_result()

pyarrow/ipc.pxi in pyarrow.lib._RecordBatchWriter.write_batch (/Users/travis/build/apache/arrow-dist/arrow/python/build/temp.macosx-10.6-intel-3.6/lib.cxx:59238)()

pyarrow/error.pxi in pyarrow.lib.check_status (/Users/travis/build/apache/arrow-dist/arrow/python/build/temp.macosx-10.6-intel-3.6/lib.cxx:8113)()

ArrowNotImplementedError: Unable to convert type: null

{code}

Presumably {{pa.deserialize_pandas}} will need a fix as well.



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