Method insert

datafusion/physical-expr/src/equivalence/properties/dependency.rs:100–106

Insert a new dependency, returns false if the dependency was already in the map returns true if the dependency was newly inserted

(
        &mut self,
        target: &'a PhysicalSortExpr,
        dep: &'a PhysicalSortExpr,
    )

    /// returns false if the dependency was already in the map
    /// returns true if the dependency was newly inserted
    fn insert(
        &mut self,
        target: &'a PhysicalSortExpr,
        dep: &'a PhysicalSortExpr,
    ) -> bool {
        self.seen.entry(target).or_default().insert(dep)
    }

    /// This function recursively analyzes the dependencies of the given sort
    /// expression within the given dependency map to construct lexicographical