final TestFloatColumnSelector selector = new TestFloatColumnSelector(values);
FilteredAggregatorFactory factory = new FilteredAggregatorFactory(
"test",
new DoubleSumAggregatorFactory("billy", "value"),
new NotDimFilter(new SelectorDimFilter("dim", "b"))
);
FilteredAggregator agg = (FilteredAggregator) factory.factorize(
makeColumnSelector(selector)
);