Github user leifwalsh commented on the issue:
https://github.com/apache/spark/pull/15821
The next iteration of this for perf would likely involve generating the
arrow batches on executors and having the driver use the new streaming arrow
format to just forward this to python. In our experiments, assembling arrays of
internal rows dominates time, then transposing them and forming an arrow record
batch is pretty quick. If we can do that work in parallel on the executors,
we're likely to get another big win.
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