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