[jira] [Created] (ARROW-11742) [Rust] [DataFusion] Add Expr::is_null and Expr::is_not_null functions

["Andrew Lamb (Jira)" <ji...@apache.org>]

Andrew Lamb created ARROW-11742:
-----------------------------------

             Summary: [Rust] [DataFusion] Add Expr::is_null and Expr::is_not_null functions
                 Key: ARROW-11742
                 URL: https://issues.apache.org/jira/browse/ARROW-11742
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Andrew Lamb


There are functions such as `Expr::lt` for building up expression trees more simply

I recently noticed that there is no `Expr::is_null()` or `Expr::is_not_null` for easily creating `Expr::IsNull(..)` and `Expr::IsNotNull(..)`, respectively.  Instead users must currently do something like;
```

                let tag_name_is_not_null = Expr::IsNotNull(Box::new(col(tag_name)));
```



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