[jira] [Created] (ARROW-1732) [Python] RecordBatch.from_pandas fails on DataFrame with no columns when preserve_index=False

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-1732:
-----------------------------------

             Summary: [Python] RecordBatch.from_pandas fails on DataFrame with no columns when preserve_index=False
                 Key: ARROW-1732
                 URL: https://issues.apache.org/jira/browse/ARROW-1732
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Wes McKinney
             Fix For: 0.8.0


I believe this should have well-defined behavior and not raise an error:

{code}
In [5]: pa.RecordBatch.from_pandas(pd.DataFrame({}), preserve_index=False)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-5-4dda72b47dbd> in <module>()
----> 1 pa.RecordBatch.from_pandas(pd.DataFrame({}), preserve_index=False)

~/code/arrow/python/pyarrow/table.pxi in pyarrow.lib.RecordBatch.from_pandas (/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:39957)()
    586             df, schema, preserve_index, nthreads=nthreads
    587         )
--> 588         return cls.from_arrays(arrays, names, metadata)
    589 
    590     @staticmethod

~/code/arrow/python/pyarrow/table.pxi in pyarrow.lib.RecordBatch.from_arrays (/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:40130)()
    615 
    616         if not number_of_arrays:
--> 617             raise ValueError('Record batch cannot contain no arrays (for now)')
    618 
    619         num_rows = len(arrays[0])

ValueError: Record batch cannot contain no arrays (for now)
{code}



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