jayzhan211 commented on PR #6796:
URL: 
https://github.com/apache/arrow-datafusion/pull/6796#issuecomment-1699328788

   > 2. Make a PR with just the Expr::Unnest -- maybe this could simply create 
a LogicalPlan::Unnest?
   
   To create LogicalPlan::Unnest, it seems we can only do that in the 
optimization step. But this can't avoid schema change, due to `name` 
unnest([1,2,3]) -> [1,2,3] and `type` list(i64) -> i64.


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