Github user squito commented on the issue:
https://github.com/apache/spark/pull/20422
thanks for taking a look at this @yaooqinn . To clarify -- there is no bug
you are trying to fix here, is there? Its just an optimization? From a quick
glance I think the change seems correct ... but also seems like such a minor
improvement that I'm not sure I see the value in changing this.
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