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https://issues.apache.org/jira/browse/ARROW-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Lamb reassigned ARROW-11742:
-----------------------------------
Assignee: Nga Tran
> [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
> Assignee: Nga Tran
> 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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