Rob Ambalu created ARROW-2579:
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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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