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Posted to issues@arrow.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/10/26 03:01:11 UTC
[jira] [Updated] (ARROW-1732) [Python] RecordBatch.from_pandas
fails on DataFrame with no columns when preserve_index=False
[ https://issues.apache.org/jira/browse/ARROW-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated ARROW-1732:
----------------------------------
Labels: pull-request-available (was: )
> [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
> Assignee: Wes McKinney
> Labels: pull-request-available
> 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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