[jira] [Created] (ARROW-5952) [Python] Segfault when reading empty table with category as pandas dataframe

["Daniel Nugent (JIRA)" <ji...@apache.org>]

Daniel Nugent created ARROW-5952:
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             Summary: [Python] Segfault when reading empty table with category as pandas dataframe
                 Key: ARROW-5952
                 URL: https://issues.apache.org/jira/browse/ARROW-5952
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.14.0
         Environment: Linux 3.10.0-327.36.3.el7.x86_64
Python 3.6.8
Pandas 0.24.2
Pyarrow 0.14.0

            Reporter: Daniel Nugent


I have two short sample programs which demonstrate the issue:
{code:java}
import pyarrow as pa
import pandas as pd
empty = pd.DataFrame({'foo':[]},dtype='category')
table = pa.Table.from_pandas(empty)
outfile = pa.output_stream('bar')
writer = pa.RecordBatchFileWriter(outfile,table.schema)
writer.write(table)
writer.close()
{code}
{code:java}
import pyarrow as pa
pa.ipc.open_file('bar').read_pandas()
Segmentation fault
{code}

My apologies if this was already reported elsewhere, I searched but could not find an issue which seemed to refer to the same behavior.



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