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[jira] [Created] (ARROW-2579) Appending to stremable table file format doesnt seem to work

Rob Ambalu created ARROW-2579:

             Summary: Appending to stremable table file format doesnt seem to work
                 Key: ARROW-2579
                 URL: https://issues.apache.org/jira/browse/ARROW-2579
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 0.9.0
            Reporter: Rob Ambalu

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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