Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/18659
Some comments on the performance above
1) I used the `ArrowFileWriter` that is currently in the `ArrowSerializer`
- this carries significant overhead in copying data to temporary buffers before
transferring. Using the `ArrowStreamWriter` I was seeing much better
performance, however it makes significant changes to PythonRunner in PythonRDD.
If we move forward with this I can present those changes as well.
2) This naively transfers data back into a GenericInternalRow - I'm sure
there is a better way to do this that is probably more efficient, maybe someone
more familiar with SQL internals can comment
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