alamb commented on pull request #280:
URL: https://github.com/apache/arrow-datafusion/pull/280#issuecomment-835267036


   That makes sense, thank you for the clarification
   
   On Fri, May 7, 2021 at 5:53 PM Daniël Heres ***@***.***>
   wrote:
   
   > I don't really understand the concerns about column expressions and what
   > might be bad here. The alternate is probably to keep a "name" field on all
   > Exprs which was the approach in apache/arrow#9600
   > <https://github.com/apache/arrow/pull/9600>
   >
   > Happy to reconsider! My main concern is that introducing aliases for
   > unnamed expressions will cause other "strange" issues like using the name
   > of the expression, like:
   > select "1+1" from (select 1+1) t
   >
   > Which should fail but would return 2?
   >
   > I think we should make sure unnamed expressions can only be referenced by
   > index, or with * and not by a generated name.
   >
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