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