bvarghese1 commented on PR #24009:
URL: https://github.com/apache/flink/pull/24009#issuecomment-1888372875

   > From reading the code for `StreamExecIntervalJoin`, I noticed 
pad/filter-left/right transformations. Seems like those can be produced when 
the `TABLE_EXEC_LEGACY_TRANSFORMATION_UIDS` is used.
   > 
   > Since it is a legacy thing, not sure if we want to test it or not.
   
   `TABLE_EXEC_LEGACY_TRANSFORMATION_UIDS` is a deprecated config. It is used 
in the `createNegativeWindowSizeJoin` function and I have added a test case 
which covers that path.


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