walterddr commented on issue #12217:
URL: https://github.com/apache/pinot/issues/12217#issuecomment-1879579694

   > @walterddr` are we sure about this? Then how does partial-upserts work? 
Before applying the transformation?
   
   Double checked and I think it's the other way around --> transform is always 
being applied before the upsert change is made to the previous valid row. So 
that seems to be a valid solution? E.g. if user have a schema that's not a 
Boolean column. We can always derive a Boolean column out and use that as the 
delete recordColunm. Will that solve your problem (schema change is required 
but it is addition, not type changes)


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