Method all_out_ref_exprs

datafusion/expr/src/logical_plan/plan.rs:426–447

Returns all the out reference(correlated) expressions (recursively) in the current logical plan nodes and all its descendant nodes.

(self: &LogicalPlan)

    /// Returns all the out reference(correlated) expressions (recursively) in the current
    /// logical plan nodes and all its descendant nodes.
    pub fn all_out_ref_exprs(self: &LogicalPlan) -> Vec<Expr> {
        let mut exprs = vec![];
        self.apply_expressions(|e| {
            find_out_reference_exprs(e).into_iter().for_each(|e| {
                if !exprs.contains(&e) {
                    exprs.push(e)
                }
            });
            Ok(TreeNodeRecursion::Continue)
        })
        // closure always returns OK
        .unwrap();
        self.inputs()
            .into_iter()
            .flat_map(|child| child.all_out_ref_exprs())
            .for_each(|e| {
                if !exprs.contains(&e) {
                    exprs.push(e)
                }
            });
        exprs
    }

    /// Returns all inputs / children of this `LogicalPlan` node.
    ///