xiangqiao123 opened a new issue #9689: groupBy query: limit push down to segment scan is poor performance URL: https://github.com/apache/druid/issues/9689 ### Affected Version 0.17.1 ### Description When druid-0.17.1 is used, the performance of group by query is worse than druid-0.16.1. When applylimitpushdowntosegment is set to false in query context, the performance returns to normal. From this figure, we can see that the CPU consumption is in LimitedBufferHashGrouper.  @himanshug
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