Method contains

datafusion/optimizer/src/join_key_set.rs:51–54

Return true if the set contains a join pair where left = right or right = left

(&self, left: &Expr, right: &Expr)

    /// Return true if the set contains a join pair
    /// where left = right or right = left
    pub fn contains(&self, left: &Expr, right: &Expr) -> bool {
        self.inner.contains(&ExprPair::new(left, right))
            || self.inner.contains(&ExprPair::new(right, left))
    }

    /// Insert the join key `(left = right)` into the set  if join pair `(right =
    /// left)` is not already in the set