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* Vectorized theta sketch aggregator. Also a refactoring of BufferAggregator and VectorAggregator such that they share a common interface, BaseBufferAggregator. This allows implementing both in the same file with an abstract + dual subclass structure. * Rework implementation to use composition instead of inheritance. * Rework things to enable working properly for both complex types and regular types. Involved finally moving makeVectorProcessor from DimensionHandlerUtils into ColumnProcessors and harmonizing the two things. * Add missing method. * Style and name changes. * Fix issues from inspections. * Fix style issue.