Github user ouyangxiaochen commented on the issue:
https://github.com/apache/spark/pull/17628
This is a very heavy task. So far, I found a problem with this when I was
reading SparkSQL source code.
So, whether we need to merge to the master or not? @srowen @viirya
As for the keyword "return", I found that there are so many scala methods
use this keyword. So, this problem can be reverted to the origin.
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