[GitHub] [incubator-doris] zbtzbtzbt edited a comment on issue #7008: [Enhance] use predicate if in bitmap_union_count() can not hit rollup.

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

zbtzbtzbt edited a comment on issue #7008:
URL: https://github.com/apache/incubator-doris/issues/7008#issuecomment-968689508


   还有另一个问题也反馈一下，sum(case when)这种写法，也属于聚合函数里面用表达式
   当存在隐式转换时，也可能不会命中rollup，比如从int转化为bigint就命中不了了
   猜测转换的原因是怕数据溢出吧
   ```
   explain
   select dt,
         sum(arrived_waybill_cnt) as arrived_waybill_cnt
         , sum(case when delivery_type_second_level_code=2 then arrived_waybill_cnt end) as arrived_waybill_cnt_jiameng
    from bi_peisong.app_rider_model_ctl_sa_view_day
   where dt > 20211022 and dt<= 20211109
     and delivery_type_second_level_code in (2,4)
   group by dt
   ```


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