why the Rating(user: Int, product: Int, rating: Double)(in MLlib's ALS), the 'user' and 'product' must be Int?

[futureage <li...@gmail.com>]

hi, 
i am learning the MLlib's ALS, when i saw the case class Rating(user: Int,
product: Int, rating: Double), i want to know why the 'user' and 'product'
are Int, they are just id, Long or String is not ok? 

thanks



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