gortiz commented on PR #8979:
URL: https://github.com/apache/pinot/pull/8979#issuecomment-1198911033

   > For descending order, ideally we should implement an iterator which can 
read rows in reverse order
   
   That was my first approach and for sure it would be better. But the cursor 
interface specifies that iteration must be done in ascending order. I tried to 
add a new reverse cursor that doesn't do that, but I wasn't sure about its 
implications. If there is some out code there that assumes all cursor 
iterations are going to be ascending, we may have problems. Therefore I prefer 
to initially add an implementation that is more conservative.


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