walterddr commented on issue #11651:
URL: https://github.com/apache/pinot/issues/11651#issuecomment-1762238266

   automating hints are a much wider topic (getting cost-factory to hook-in, 
getting table metadata to feed into cost factory etc) and i would like to keep 
that separate.
   
   but to answer your question, auto setting join to lookup if RHS is dim table 
doesn't work --> 
   - there's no guarantee the left side is a normal table, or a join result, or 
a temp table, etc.
   - there's also situation that LHS is a semi-join result following by a 
LOOKUP, which can apply automatically but can't be determine until we have 
cost-factory and table metadata feed in. 


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