VictorvandenHoven commented on PR #14426:
URL: https://github.com/apache/kafka/pull/14426#issuecomment-1820473595

   In javaDoc  of JoinWindows:
   
   `There are three different window configuration supported:
   before = after = time-difference
   before = 0 and after = time-difference
   before = time-difference and after = 0
   A join is symmetric in the sense, that a join specification on the first 
stream returns the same result record as a join specification on the second 
stream with flipped before and after values.
   Both values (before and after) must not result in an "inverse" window, i.e., 
upper-interval bound cannot be smaller than lower-interval bound.`
   
   I think with this change that **non-symmetric** values for the window 
configuration can be supported as well now.


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