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

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

     [ https://issues.apache.org/jira/browse/ARROW-5910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney reassigned ARROW-5910:
-----------------------------------

    Assignee: Wes McKinney

> [Python] 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
>            Assignee: Wes McKinney
>            Priority: Major
>             Fix For: 0.15.0
>
>
> 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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