Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/17770
I am not a giant fan of the `resolveOperators*` approach, is is yet another
code path that does something similar to the `transfrom*` code path, it
introduces some mutable state, and I have been bitten by it before. I
personally think that a barrier node (that is be a no-op for any rule) is a far
more elegant solution.
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