egalpin opened a new pull request, #11035:
URL: https://github.com/apache/pinot/pull/11035

   Relates to #11027 (and https://github.com/apache/pinot/pull/10704). 
   
   **The summary of changes in this PR is:  don't have `null` in 
`ComparisonColumns` list of `Comparables`, ever.**
   
   I believe this PR represents a way to _avoid_ getting into a situation where 
#11027 would be needed to recover; it doesn't, however, provide a way to 
recover from a "bad state" that #11027 _does_ help recover from.
   
   Given a column for which `isNull(<docId>)` returns true, previously an 
explicit `null` would be stored in the list of Comparables.  After this PR, the 
`defaultValue` for that column would be stored in the list of Comparables 
instead of `null`.  This allows for "regular" use of `removeNullValueField` for 
all (post-combined) non-null comparison columns.
   
   cc @KKcorps @Jackie-Jiang thoughts?


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