himanshug commented on issue #8242: should we deprecate extractionFn field in various Aggregators and Filters URL: https://github.com/apache/incubator-druid/issues/8242#issuecomment-518685289 @gianm I think we could do something on the line of rewriting the query in early stage of processing pipeline at broker to... for each aggregator/filter/whatever, auto generate the virtual columns spec and set extractionFn field to null in it. that said, doing and testing it is overhead if we decide to "deprecate and remove" it. OTOH if you mean that we should not deprecate extractionFn field and will always keep the compatibility layer, then it may make sense to write it.
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