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* Refactor ColumnSelectorFactory; Rely on ColumnValueSelector's polymorphism * Fix MapVirtualColumn.makeColumnValueSelector() * Minor fixes * Fix IndexGeneratorCombinerTest * DimensionSelector to return zeros when treated as numeric ColumnValueSelector * Fix IncrementalIndexTest * Fix IncrementalIndex.makeColumnSelectorFactory() * Optimize MapBasedRow.getMetric() * Fix VarianceAggregatorTest * Simplify IncrementalIndex.makeColumnSelectorFactory() * Address comments * More comments * Test