izveigor commented on issue #6555:
URL: 
https://github.com/apache/arrow-datafusion/issues/6555#issuecomment-1601286281

   Yes @jayzhan211, I know about this feature: (See PR: 
https://github.com/apache/arrow-datafusion/pull/5106).
   It only works in Rust implementation (the function `unnest_columns`) but it 
doesn't in SQL. I only found the expression `InUnnest` in `sqlparser-rs`: 
https://docs.rs/sqlparser/latest/sqlparser/ast/enum.Expr.html#variant.InUnnest.
   Therefore, I wonder how we will recognize this token 🤔
   
   Also If we want to stick to the standard implementation of the function 
(MySQL, PostgreSQL and other),I think we should implement the scalar function 
as well.
   
   @jackwener @alamb @tustvold What do you think about it?


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