[jira] [Updated] (ARROW-10617) [Python] RecordBatchStreamReader's iterator doesn't work with python 3.8

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

     [ https://issues.apache.org/jira/browse/ARROW-10617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney updated ARROW-10617:
---------------------------------
    Summary: [Python] RecordBatchStreamReader's iterator doesn't work with python 3.8  (was: RecordBatchStreamReader's iterator doesn't work with python 3.8)

> [Python] RecordBatchStreamReader's iterator doesn't work with python 3.8
> ------------------------------------------------------------------------
>
>                 Key: ARROW-10617
>                 URL: https://issues.apache.org/jira/browse/ARROW-10617
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 1.0.1
>            Reporter: Tao He
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The following example code doesn't work with python 3.8:
> {{import pyarrow as pa}}
> {{ data = [}}
> {{ pa.array([1, 2, 3, 4]),}}
> {{ pa.array(['foo', 'bar', 'baz', None]),}}
> {{ pa.array([True, None, False, True])}}
> {{ ]}}
> {{ batch = pa.record_batch(data, names=['f0', 'f1', 'f2'])}}
> {{sink = pa.BufferOutputStream()}}
> {{ writer = pa.ipc.new_stream(sink, batch.schema)}}
> {{for i in range(5):}}
> {{ writer.write_batch(batch)}}
> {{ writer.close()}}
> {{ buf = sink.getvalue()}}
> {{reader = pa.ipc.open_stream(buf)}}
> {{ [i for i in reader]}}
> It will raise the following runtime error:
> {{StopIteration Traceback (most recent call last)}}
> {{ /usr/local/lib/python3.8/dist-packages/pyarrow/ipc.pxi in pyarrow.lib._CRecordBatchReader.read_next_batch()}}
> {{StopIteration:}}
> {{During handling of the above exception, another exception occurred:}}
> {{RuntimeError Traceback (most recent call last)}}
> {{ <ipython-input-7-225bed213dc7> in <module>}}
> {{ 18 reader = pa.ipc.open_stream(buf)}}
> {{ 19}}
> {{ ---> 20 [i for i in reader]}}
> {{<ipython-input-7-225bed213dc7> in <listcomp>(.0)}}
> {{ 18 reader = pa.ipc.open_stream(buf)}}
> {{ 19}}
> {{ ---> 20 [i for i in reader]}}
> {{/usr/local/lib/python3.8/dist-packages/pyarrow/ipc.pxi in __iter__()}}
> {{RuntimeError: generator raised StopIteration}}



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