himanshug opened a new issue #8242: should we deprecate extractionFn field in various Aggregators and Filters URL: https://github.com/apache/incubator-druid/issues/8242 they were added before `VirtualColumn` was introduced and I think a better alternative now could be to have a extractionFn based `VirtualColumn` that could be used. That way, all the filter and aggregator implementations don't need to handle them in different places.
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