def getQ2QHost():
Given two data frames, it filters from the testing frame all the non-new items.
dataset/ETHPy150Open twisted/vertex/vertex/ivertex.py/IQ2QTransport.getQ2QHost--crossover with--dataset/ETHPy150Open grafos-ml/test.fm/src/testfm/splitter/split_utils.py/not_new_items_filter