[GitHub] [pinot] 61yao commented on pull request #9832: [multistage] support sort push-down

[GitBox <gi...@apache.org>]

61yao commented on PR #9832:
URL: https://github.com/apache/pinot/pull/9832#issuecomment-1324147001

   > @Jackie-Jiang - yes, the V2 engine requires that the server returns columns in the order that would be the result of the logical plan (and also that it doesn't have extra or missing columns, which could be the case of the order by column wasn't selected or a column was selected multiple times).
   > 
   > Calcite makes assumptions that each stage will return results that are "correct" for that logical stage. The alternative would be, instead of building this into v1, wrapping the v2 leaf stage with an operator that rearranges columns but it felt like this flag would be the exact thing we should leverage.
   
   Is it possible we re-arrange columns in intermediate stage instead if we pass data schema to intermediate stage? This way we can leave the leaf stage untouched. 


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