Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/20433
  
    This is a breaking change, I can't think of a way to work around it. e.g. 
`SELECT 2 SECONDS` will change its semantic after this PR. Even if we provide a 
conf, it's very hard for users to realize the semantic has been changed. I'd 
like to hold this PR until Spark 3.0.


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