Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/15821
> Parallelizing the record batch conversion and streaming it to Python
would be another significant perf win.
Right, I should have also mentioned that this PR takes a simplistic
approach and collects rows to the driver, where all the conversion is done.
Offloading this to the executors should boost the performance more.
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