Github user icexelloss commented on the issue:
https://github.com/apache/spark/pull/21650
This PR takes me a while to get to because I am not very familiar with
Catalyst rules. I think in the end the change is relative simple but I would
appreciate some more careful review from people that are familiar with Catalyst.
cc @BryanCutler @gatorsmile @HyukjinKwon @ueshin
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