pzhdfy commented on issue #7896: Query like collect_list and collect_set support URL: https://github.com/apache/incubator-druid/issues/7896#issuecomment-525560504 As a workround, you can implement BufferedAggregator on heap. I have done a BufferedAggregator on heap. extensions-contrib/unique/src/main/java/org/apache/druid/query/aggregation/unique/UniqueBufferAggregator.java https://github.com/apache/incubator-druid/pull/7594
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