Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10678#issuecomment-171344340
In the implementation, I think we need to use the extra collection to
record which child can resolve the missing attributes when handling the binary
operators. For example, `Join` has two children, we have to know which child
should add missing Attributes (except left-semi and left-anti) . That means, we
need to use the solution I did at the beginning. Is that OK to you?
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