Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/11557#issuecomment-199512015
btw here's another idea -- we don't need to do it as part of this pr.
it'd still be great to have those parser tests compare plans. The problem
in the past was it's annoying to update those plans when the parser changes.
However, if we can make these compare against some reference files that are
just the plans in their json representations, it becomes much easier to update
these plans.
Same thing goes for optimization rules.
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