jayzhan211 commented on PR #6796:
URL: 
https://github.com/apache/arrow-datafusion/pull/6796#issuecomment-1668756534

   > As this PR is large and I would like to move it along, I suggest
   > 
   > 1. Remove `flatten` (we can put that into another PR)
   > 2. Make a PR with just the `Expr::Unnest` -- maybe this could simply 
create a `LogicalPlan::Unnest`?
   > 3. Make a PR to add any additional features needed for unnest (like 
multiple column support, for example)
   
   Let me work on https://github.com/apache/arrow-datafusion/issues/6995 first 
since I don't think simply creating LogicalPlan from Expr::Unnest is trivial.


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