presto-main/src/main/java/io/prestosql/sql/planner/plan/JoinNode.java/EquiJoinClause/equals
class EquiJoinClause:        @Override
        public boolean equals(Object obj)
        {
            if (this == obj) {
                return true;
            }

            if (obj == null || !this.getClass().equals(obj.getClass())) {
                return false;
            }

            EquiJoinClause other = (EquiJoinClause) obj;

            return Objects.equals(this.left, other.left) &&
                    Objects.equals(this.right, other.right);
        }