Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18687
> The changes of this PR (before this comment) is changing the fundamental
of the Catalyst design. More importantly, it could also hurt the third-party
libraries which are built on Spark SQL. Thus, writing a detailed design doc
(SPIP) might be better.
If it's necessary, I'd write the doc. Currently the change is just limited
to the internal of `QueryExecution`.
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