[jira] [Updated] (ARROW-4836) [Python] "Cannot tell() a compressed stream" when using RecordBatchStreamWriter

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-4836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-4836:
----------------------------------
    Labels: pull-request-available  (was: )

> [Python] "Cannot tell() a compressed stream" when using RecordBatchStreamWriter
> -------------------------------------------------------------------------------
>
>                 Key: ARROW-4836
>                 URL: https://issues.apache.org/jira/browse/ARROW-4836
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.12.1
>            Reporter: Mike Pedersen
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.15.0
>
>
> It does not seem like RecordBatchStreamWriter works with compressed streams:
> {code:python}
> >>> import pyarrow as pa
> >>> pa.__version__
> '0.12.1'
> >>> stream = pa.output_stream('/tmp/a.gz')
> >>> batch = pa.RecordBatch.from_arrays([pa.array([1])], ['a'])
> >>> writer = pa.RecordBatchStreamWriter(stream, batch.schema)
> >>> writer.write(batch)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "pyarrow/ipc.pxi", line 181, in pyarrow.lib._RecordBatchWriter.write
>   File "pyarrow/ipc.pxi", line 196, in pyarrow.lib._RecordBatchWriter.write_batch
>   File "pyarrow/error.pxi", line 89, in pyarrow.lib.check_status
> pyarrow.lib.ArrowNotImplementedError: Cannot tell() a compressed stream
> {code}
> As I understand the documentation, this should be possible, right?



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