Adding Un-pivot implementation

cardillo / joinery

Data frames for Java

https://joinery.sh

GNU General Public License v3.0

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Adding Un-pivot implementation #80

Open stahamtan opened 5 years ago

stahamtan commented 5 years ago

I have used joinery on a project and found unpivot method quite useful in processing dataframes. I have added my implementation, as well as unit test. Will be glad if you review and let me know your thoughts.