[ARROW-6370] [JS] Table.from adds 0 on int columns

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 0.14.1
• Component/s: JavaScript
• External issue URL: https://github.com/apache/arrow/issues/22744
• Assignee: Unassigned
• Reporter: Sascha Hofmann
• Created: 27/Aug/19 17:22
• Updated: 11/Jan/23 07:46
• Resolved: 21/Sep/19 04:48

Description

I am generating an arrow table in pyarrow and send it via gRPC like this:

sink = pa.BufferOutputStream()        
writer = pa.RecordBatchStreamWriter(sink, batch.schema)        writer.write_batch(batch)        
writer.close()        
yield ds.Response(
    status=200,
    loading=False,
    response=[sink.getvalue().to_pybytes()]   
)

On the javascript end, I parse it like that:

 Table.from(response.getResponseList()[0])

That works but when I look at the actual table, int columns have a 0 for every other row. String columns seem to be parsed just fine. 

The Python byte array created from to_pybytes() has the same length as received in javascript. I am also able to recreate the original table for the byte array in Python.