adriangb commented on code in PR #19538:
URL: https://github.com/apache/datafusion/pull/19538#discussion_r2721539140
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datafusion/expr/src/expr.rs:
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@@ -1933,6 +1933,32 @@ impl Expr {
}
}
+ /// Returns the triviality classification of this expression.
+ ///
+ /// Trivial expressions include column references, literals, and nested
+ /// field access via `get_field`.
+ ///
+ /// # Example
+ /// ```
+ /// # use datafusion_expr::{col, ArgTriviality};
+ /// let expr = col("foo");
+ /// assert_eq!(expr.triviality(), ArgTriviality::Column);
+ /// ```
+ pub fn triviality(&self) -> ArgTriviality {
+ match self {
+ Expr::Column(_) => ArgTriviality::Column,
Review Comment:
Same reasoning as
https://github.com/apache/datafusion/pull/19538#discussion_r2721536334
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