Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/15415
I tried a few different ways to implement the transform.
https://gist.github.com/hhbyyh/889b88ae2176d1263fdc9dd3e29d1c2d.
The performance actually are similiar, while the current one can maintain
the original order of the input dataset. I would be glad to see an more
optimized version.
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