silundong commented on PR #4619:
URL: https://github.com/apache/calcite/pull/4619#issuecomment-3641062444

   > Can you write some documentation someplace (could be JavaDoc or JIRA) 
about how one should proceed to replace the old decorrelator with this one?
   
   Sure, I will add some JavaDoc in TopDownDecorrelator.java.
   
   From my observation, the most commonly used tests are RelOptRulesTest and 
the Quidem tests. RelOptRulesTest can already switch the decorrelator via 
configuration. Quidem tests involves the entire SQL execution. After completing 
the LEFT MARK join under the Enumerable convention, may be we can integrate the 
new decorrelator into the Quidem tests and make the switch configurable in the 
iq files. 


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