presto-parser/src/main/java/io/prestosql/sql/tree/GroupingSets.java/GroupingSets/equals
class GroupingSets:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        GroupingSets groupingSets = (GroupingSets) o;
        return Objects.equals(sets, groupingSets.sets);
    }