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https://issues.apache.org/jira/browse/ARROW-2579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-2579:
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Fix Version/s: (was: 0.14.0)
> [Python] Appending to streamable table file format doesn't seem to work
> -----------------------------------------------------------------------
>
> Key: ARROW-2579
> URL: https://issues.apache.org/jira/browse/ARROW-2579
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.9.0
> Reporter: Rob Ambalu
> Priority: Major
>
> As far as I can tell it looks like appending to a streaming file format isn’t
> currently supported, is that right?
> RecordBatchStreamWriter always writes the schema up front, and it doesn’t
> look like a schema is expected mid file ( assuming im doing this append test
> correctly, this is the error I hit when I try to read back this file into
> python:
> Traceback (most recent call last):
> File "/home/ra7293/rba_arrow_mmap.py", line 9, in <module>
> table = reader.read_all()
> File "ipc.pxi", line 302, in pyarrow.lib._RecordBatchReader.read_all
> File "error.pxi", line 79, in pyarrow.lib.check_status
> pyarrow.lib.ArrowIOError: Message not expected type: record batch, was: 1
>
> This reader script works fine if I write once / don’t append.
> Seeing as IO interfaces support Append, streaming should support it as well (
> if for whatever reason this cant be supported, RecordBatchStreamWriter should
> throw if configured with an OutputStreamer that is attempting to append )
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