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https://issues.apache.org/jira/browse/ARROW-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney reassigned ARROW-1584:
-----------------------------------
Assignee: Wes McKinney
> [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
> Assignee: Wes McKinney
> Priority: Minor
> Labels: python, serialization
> 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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