Github user datumbox commented on the issue:
https://github.com/apache/spark/pull/17059
@imatiach-msft This comparison is intentional and checks 2 things: That the
number is within integer range and that the Id does not have any non-zero
digits after the decimal point. If the number is outside integer range the
intValue will overflow and the number will not match its double part. Moreover
if it has fractional part it will also will not match the integer.
Effectively we are making sure that the UserId and ItemId have values
within integer range.
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