Github user zuyu commented on the issue:

    https://github.com/apache/incubator-quickstep/pull/98
  
    @hbdeshmukh I guess the possible performance improvements come from a) 
using `DateLit` instead of `DatetimeLit`, b) a better implementation of 
`Extract` function, but not the internal representation of `DateLit`.
    
    @hakanmemisoglu Could you please split the changes in this PR into multiple 
new PRs, and then compare the performance only between two different 
representation of `DateLit`? Thanks!


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