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