Method contains_outer

datafusion/expr/src/expr.rs:2122–2125

Return true if the expression contains out reference(correlated) expressions.

(&self)

    /// Return true if the expression contains out reference(correlated) expressions.
    pub fn contains_outer(&self) -> bool {
        self.exists(|expr| Ok(matches!(expr, Expr::OuterReferenceColumn { .. })))
            .expect("exists closure is infallible")
    }

    /// Returns true if the expression contains a scalar subquery.
    pub fn contains_scalar_subquery(&self) -> bool {