Github user jzhuge commented on the issue:
https://github.com/apache/spark/pull/21911
@rdblue Could you please review the latest code?
It has been greatly simplified. No change in SqlBase.g4 necessary.
For multiple coalesce hints, the optimizer will only pick the leftmost
hint. This behavior is similar to multiple coalesce/repartition calls in
Dataset, except the rightmost call is the winner.
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