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From "Matthew Rocklin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ARROW-434) Segfaults and encoding issues in Python Parquet reads
Date Tue, 20 Dec 2016 15:20:58 GMT
Matthew Rocklin created ARROW-434:
-------------------------------------

             Summary: Segfaults and encoding issues in Python Parquet reads
                 Key: ARROW-434
                 URL: https://issues.apache.org/jira/browse/ARROW-434
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
         Environment: Ubuntu, Python 3.5, installed pyarrow from conda-forge
            Reporter: Matthew Rocklin
            Priority: Minor


I've conda installed pyarrow and am trying to read data from the parquet-compatibility project.
 I haven't explicitly built parquet-cpp or anything and may or may not have old versions lying
around, so please take this issue with some salt:

{code:python}
In [1]: import pyarrow.parquet

In [2]: t = pyarrow.parquet.read_table('nation.plain.parquet')
---------------------------------------------------------------------------
ArrowException                            Traceback (most recent call last)
<ipython-input-2-5d966681a384> in <module>()
----> 1 t = pyarrow.parquet.read_table('nation.plain.parquet')

/home/mrocklin/Software/anaconda/lib/python3.5/site-packages/pyarrow/parquet.pyx in pyarrow.parquet.read_table
(/feedstock_root/build_artefacts/work/arrow-79344b335849c2eb43954b0751018051814019d6/python/build/temp.linux-x86_64-3.5/parquet.cxx:2783)()

/home/mrocklin/Software/anaconda/lib/python3.5/site-packages/pyarrow/parquet.pyx in pyarrow.parquet.ParquetReader.read_all
(/feedstock_root/build_artefacts/work/arrow-79344b335849c2eb43954b0751018051814019d6/python/build/temp.linux-x86_64-3.5/parquet.cxx:2200)()

/home/mrocklin/Software/anaconda/lib/python3.5/site-packages/pyarrow/error.pyx in pyarrow.error.check_status
(/feedstock_root/build_artefacts/work/arrow-79344b335849c2eb43954b0751018051814019d6/python/build/temp.linux-x86_64-3.5/error.cxx:1185)()

ArrowException: NotImplemented: list<: uint8>
{code}

Additionally I tried to read data from a Python file-like object pointing to data on S3. 
Let me know if you'd prefer a separate issue.

{code:python}
In [1]: import s3fs

In [2]: fs = s3fs.S3FileSystem()

In [3]: f = fs.open('dask-data/nyc-taxi/2015/parquet/part.0.parquet')

In [4]: f.read(100)
Out[4]: b'PAR1\x15\x00\x15\x90\xc4\xa2\x12\x15\x90\xc4\xa2\x12,\x15\xc2\xa8\xa4\x02\x15\x00\x15\x06\x15\x08\x00\x00\x00\x80\xbf\xe7\x8b\x0b\x05\x00\x00\x80\xbf\xe7\x8b\x0b\x05\x00\x00\x80\xbf\xe7\x8b\x0b\x05\x00@\xc2\xce\xe7\x8b\x0b\x05\x00\xc0F\xed\xe7\x8b\x0b\x05\x00\xc0F\xed\xe7\x8b\x0b\x05\x00\x00\x89\xfc\xe7\x8b\x0b\x05\x00@\xcb\x0b\xe8\x8b\x0b\x05\x00\x80\r\x1b\xe8\x8b\x0b'

In [5]: import pyarrow.parquet

In [6]: t = pyarrow.parquet.read_table(f)
Segmentation fault (core dumped)
{code}

Here is a more reproducible version:

{code:python}
In [1]: with open('nation.plain.parquet', 'rb') as f:
   ...:     data = f.read()
   ...:     

In [2]: from io import BytesIO

In [3]: f = BytesIO(data)

In [4]: f.seek(0)
Out[4]: 0

In [5]: import pyarrow.parquet

In [6]: t = pyarrow.parquet.read_table(f)
Segmentation fault (core dumped)
{code}

I was however pleased with round-trip functionality within this project, which was very pleasant.



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