Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/13221#issuecomment-221757617
Thanks a lot @marmbrus for your suggestion, as you mentioned currently we
could get the physical plan only when query is started, which is counter to the
goal of explain.
But I think it is quite useful for user to understanding the translated
plan. One thing we could do is to change the api to be different from
`explain`, so that we will not have this semantic break. Also a better solution
is to find out a good solution to get the plan without really executing the
query.
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