egalpin commented on PR #10704:
URL: https://github.com/apache/pinot/pull/10704#issuecomment-1532199044

   > So the fix should be: when comparisonIndex is -1, loop over all values and 
check if it has any value larger than the value in another ComparisonColumns. 
There is no need to modify the value within the current ComparisonColumns 
because it should already have values set.
   
   One case I'm struggling to figure out how to support is when altering from 
one set of comparison columns to a new set. In such a case, I believe there 
would be a need to modify the value within the current ComparisonColumns (ex. 
adding 1 new column in addition to a set of existing comparison columns, or 
migrating from a single comparison column to a set of columns).


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