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https://issues.apache.org/jira/browse/ARROW-5374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16844778#comment-16844778
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David Li commented on ARROW-5374:
---------------------------------
The error message is backwards, because in
[ipc/reader.cc|https://github.com/apache/arrow/blob/master/cpp/src/arrow/ipc/reader.cc],
CHECK_MESSAGE_TYPE takes (expected, actual) but is used as (actual, expected).
> [Python] pa.read_record_batch() doesn't work
> --------------------------------------------
>
> Key: ARROW-5374
> URL: https://issues.apache.org/jira/browse/ARROW-5374
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: Antoine Pitrou
> Priority: Major
>
> {code:python}
> >>> batch = pa.RecordBatch.from_arrays([pa.array([b"foo"], type=pa.utf8())],
> >>> names=['strs'])
> >>>
> >>> stream = pa.BufferOutputStream()
> >>> writer = pa.RecordBatchStreamWriter(stream, batch.schema)
> >>> writer.write_batch(batch)
> >>>
> >>>
> >>> writer.close()
> >>>
> >>>
> >>> buf = stream.getvalue()
> >>>
> >>>
> >>> pa.read_record_batch(buf, batch.schema)
> >>>
> >>>
> Traceback (most recent call last):
> File "<ipython-input-31-4f168f453f3a>", line 1, in <module>
> pa.read_record_batch(buf, batch.schema)
> File "pyarrow/ipc.pxi", line 583, in pyarrow.lib.read_record_batch
> check_status(ReadRecordBatch(deref(message.message.get()),
> File "pyarrow/error.pxi", line 87, in pyarrow.lib.check_status
> raise ArrowIOError(message)
> ArrowIOError: Expected IPC message of type schema got record batch
> {code}
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