Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18687
I think you might push more changes in the following few hours. If the
changes are clean and safe, we still need a SQLConf to ensure the behaviors can
be changed back. We might not be able to accept any behavior change in 2.x.
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.
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