Github user yhuai commented on the issue:

    https://github.com/apache/spark/pull/16613
  
    is there a feature flag that is used to determine if we use this new 
approach? I feel it will be good to have an internal feature flag to determine 
the code path. So, if there is something wrong that is hard to fix quickly 
before the release, we can still switch back to the old code path. Then, in the 
next release, we can remove the feature flag. What do you think?
    
    Also, @jiangxb1987 can you take a look at the SQLViewSuite and see if we 
have enough test coverage?


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