Github user adrian-wang commented on the pull request:
https://github.com/apache/spark/pull/8335#issuecomment-133298380
I read the code and find the comparator used here is not the same as we
previously implemented.
For `UnsignedBytes`
public static int compare(byte a, byte b) {
return toInt(a) - toInt(b);
}
public static int toInt(byte value) {
return value & UNSIGNED_MASK;
}
private static final int UNSIGNED_MASK = 0xFF;
While for `java.lang.Byte`:
public static int compare(byte x, byte y) {
return x - y;
}
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