Bugfix for #215

[FlynnWangNewZealand]

Problem caused by DataSetBuilder.build(). The rowKey which is an instance of TreeSet is sorted by natural ordering.

The values of rowKey seems not visible to end users, got a quick way to fix the issue by adding a prefix to each of them.

Issue#215

Testing done

I have created a class to test this function. Just to save a .png picture to my local.

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