leventov opened a new issue #6909: Remove 
CardinalityAggregatorColumnSelectorStrategy and 
CardinalityAggregatorColumnSelectorStrategyFactory as too shallow abstractions.
URL: https://github.com/apache/incubator-druid/issues/6909
 
 
   The logic of `CardinalityAggregatorColumnSelectorStrategyFactory` could be 
inlined in `CardinalityAggregatorFactory.factorize()` and `factorizeBuffered()` 
methods, and the logic of `CardinalityAggregatorColumnSelectorStrategy` could 
be expressed in subclasses of `CardinalityBufferAggregator` and 
`CardinalityAggregator`.
   
   This change is similar to what is proposed here: 
https://github.com/apache/incubator-druid/pull/6397#discussion_r250564034

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