Jackie-Jiang commented on PR #14758:
URL: https://github.com/apache/pinot/pull/14758#issuecomment-2580805351

   When there is no project to the right table, there are 4 ways to execute:
   - Regular join without distinct on right table
   - Regular join with distinct on right table (not possible, always rewritten 
to SEMI join)
   - SEMI join without distinct on right table (won't be possible with the new 
rule)
   - SEMI join with distinct on right table
   
   Ideally, we want to able to control which one to use because each of them 
might be best for certain use cases.


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