presto-main/src/main/java/io/prestosql/sql/planner/optimizations/ExpressionEquivalence.java/ExpressionEquivalence/ListComparator
class ExpressionEquivalence:        public ListComparator(Comparator<T> elementComparator)
        {
            this.elementComparator = requireNonNull(elementComparator, "elementComparator is null");
        }