Re: [I] Consider introducing unique expression IDs in Logical/Physical plan [arrow-datafusion]

["alamb (via GitHub)" <gi...@apache.org>]

alamb commented on issue #8379:
URL: https://github.com/apache/arrow-datafusion/issues/8379#issuecomment-1836743922

   I wonder what "unique" means ? Like every newly created `Expr` gets some sort of id? 
   
   Some examples:
   
   ```rust
   // would expr1 and expr2 have the same id?
   let expr1 = col("foo");
   let expr2 = col("foo");
   ```
   
   
   ```rust
   // would expr1 and expr2 have the same id?
   let expr1 = col("foo");
   let expr2 = expr1.clone()
   ```
   


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