[jira] [Created] (ARROW-5910) read_tensor() fails on non-seekable streams

["Karsten Krispin (JIRA)" <ji...@apache.org>]

Karsten Krispin created ARROW-5910:
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             Summary: read_tensor() fails on non-seekable streams
                 Key: ARROW-5910
                 URL: https://issues.apache.org/jira/browse/ARROW-5910
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.13.0
         Environment: pyarrow installed via pip, pyarrow==0.13.0
            Reporter: Karsten Krispin


when reading a tensor from from a compressed pyarrow stream, it fails with
{code:java}
Traceback (most recent call last):
 File "test.py", line 10, in <module>
 tensor = pa.read_tensor(in_stream)
 File "pyarrow/ipc.pxi", line 470, in pyarrow.lib.read_tensor
 File "pyarrow/io.pxi", line 153, in pyarrow.lib.NativeFile.get_random_access_file
 File "pyarrow/io.pxi", line 182, in pyarrow.lib.NativeFile._assert_seekable
OSError: only valid on seekable files{code}
example code:
{code:java}
import pyarrow as pa
import numpy as np

a = np.random.random(size = (100,110,3) )

out_stream = pa.output_stream('test.pa', compression='gzip', buffer_size=None)
pa.write_tensor(pa.Tensor.from_numpy(a), out_stream)

in_stream = pa.input_stream('test.pa', compression='gzip', buffer_size=None)
tensor = pa.read_tensor(in_stream)
b = pa.Tensor.to_numpy(tensor){code}



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