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

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

     [ https://issues.apache.org/jira/browse/ARROW-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Lamb updated ARROW-11742:
--------------------------------
    Description: 
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)));
```



        // What we want:
        let expr : Expr = col("a").is_null();

        // What we have to do:
        let expr : Expr = Expr::IsNull(Box::new(col("a")));


  was:
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)));
```


> [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
>            Priority: Minor
>
> 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)));
> ```
>         // What we want:
>         let expr : Expr = col("a").is_null();
>         // What we have to do:
>         let expr : Expr = Expr::IsNull(Box::new(col("a")));



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