alamb commented on PR #3956:
URL: https://github.com/apache/arrow-rs/pull/3956#issuecomment-1487120641

   > That's not always possible, since you may not have the datatype at hand 
yet. So at least during logical planning in DF this ain't an option.
   
   🤔  I think as soon as DataFusion creates a `LogicalPlan` / `Expr` it is 
possible to get the type using 
https://docs.rs/datafusion/latest/datafusion/prelude/enum.Expr.html#impl-ExprSchemable-for-Expr
   
   Or more to the point, with a LogicalPlan you also have a `Schema` with 
`Field`


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