[GitHub] [incubator-druid] xueyumusic opened a new issue #7896: Query like collect_list and collect_set support

[GitBox <gi...@apache.org>]

xueyumusic opened a new issue #7896: Query like collect_list and collect_set support
URL: https://github.com/apache/incubator-druid/issues/7896
 
 
   When doing data statistic and anlysis, it often uses query like `concat_ws(',',collect_list(coupon_id))` after groupby. Could `collect_list` and `collect_set` be an appropriate query in druid? I found it looks a bit hard when implement collect_list as a kind of Aggregator. When implementing BufferedAggregator it does not have fixed bytebuf length and MaxIntermediateSize...

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