alamb opened a new pull request #9515:
URL: https://github.com/apache/arrow/pull/9515


   
   When I was first using the `Expr` structures, I built them using expressions 
like
   
   ```
   Expr::BinaryExpr {
     left: Box::new(Expr ...),
     right: Box::new(Expr ...),
     op: Operator::Eq
   }
   ```
     
   
   Then I found out about the much nicer syntax like
   
   ```
   let expr = col("a").eq(col("b"))
   ```
   
   
   I have seen this similar pattern with others who have been using the crate 
too (start with the more verbose syntax) and so I wanted to add some doc 
examples showing the simpler syntax
   


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