himanshug commented on issue #9689: groupBy query: limit push down to segment scan is poor performance URL: https://github.com/apache/druid/issues/9689#issuecomment-613158688 @xiangqiao123 `LimitedBufferHashGrouper ` does incur some overhead to maintain a heap to apply limit and if that overhead is more than cost of processing all rows from segments at merge stage then it can happen. can you post your groupBy query?
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