Must return an long integer that define the relational order of the 2 compared samples:
s1- The first sample to be compared
s2- The second sample to compared
s1 < s2,
0 if s1 = s2, a positive integer if
s1 > s2
void initialize(SampleMetadata metadata)
SampleMetadataof the samples to be compared.
This function is invoked before any call to the
Not that this function is the place to get sample column indexes for better performance
metadata- The metadata of the sample to be compared by this instance
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