leventov commented on issue #4672: "Object" aggregator factories mutate queryable data during index merging URL: https://github.com/apache/incubator-druid/issues/4672#issuecomment-422252377 @jihoonson rollup aggregation doesn't yet work via `makeAggregateCombiner()`, so no, this is still an open issue. The current blocker in this process is #5957.
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