[GitHub] [incubator-doris] zenoyang opened a new issue, #9079: [Enhancement] Cannot hit rollup even if the `if expr` contains the rollup dimension

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

zenoyang opened a new issue, #9079:
URL: https://github.com/apache/incubator-doris/issues/9079

   ### Search before asking
   
   - [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.
   
   
   ### Description
   
   Cannot hit rollup even if the if expr contains the rollup dimension.
   
   **Reproduce the problem: **
   ```sql
   create database db1;
   use db1;
   
   -- create table
   CREATE TABLE `tbl` (
     `dt` date NULL COMMENT "dt",
     `is_dau` tinyint(4) NULL COMMENT "is_dau",
     `is_intention` tinyint(4) NULL COMMENT "is_intention",
     `city_id` int(11) NULL COMMENT "city_id",
     `device_id` bitmap BITMAP_UNION NULL COMMENT "device_id"
   ) ENGINE=OLAP
   AGGREGATE KEY(`dt`, `is_dau`, `is_intention`, `city_id`)
   PARTITION BY RANGE(`dt`)
   (PARTITION p20220101 VALUES [('1970-01-01'), ('2022-04-10')),
   PARTITION p20220411 VALUES [('2022-04-10'), ('2022-04-11')),
   PARTITION p20220412 VALUES [('2022-04-11'), ('2022-04-12')))
   DISTRIBUTED BY HASH(`city_id`) BUCKETS 10
   PROPERTIES (
   "replication_num" = "1",
   "in_memory" = "false",
   "storage_format" = "V2"
   );
   
   -- load data
   insert into tbl values ('2022-04-11', 1, 1, 1, to_bitmap(1));
   insert into tbl values ('2022-04-11', 0, 1, 2, to_bitmap(2));
   insert into tbl values ('2022-04-11', 1, 1, 2, to_bitmap(3));
   insert into tbl values ('2022-04-11', 0, 1, 3, to_bitmap(4));
   insert into tbl values ('2022-04-11', 1, 1, 3, to_bitmap(5));
   insert into tbl values ('2022-04-11', 0, 1, 4, to_bitmap(6));
   insert into tbl values ('2022-04-11', 1, 1, 4, to_bitmap(7));
   insert into tbl values ('2022-04-11', 0, 1, 5, to_bitmap(8));
   insert into tbl values ('2022-04-11', 1, 1, 5, to_bitmap(9));
   
   -- add rollup
   ALTER TABLE db1.tbl ADD ROLLUP rollup1 (dt, is_intention, city_id, device_id);
   ```
   
   The following sql can hit `rollup1`, as expected:
   ```sql
   select city_id,
          count(distinct device_id)
   from db1.tbl
   where dt='2022-04-11' and is_intention=1
   group by city_id;
   
   -- explain sql: rollup: rollup1
   
   ```
   
   **The following sql fails to hit `rollup1`:**
   ```sql
   select city_id,
          count(distinct if(is_intention=1,device_id,NULL))
   from db1.tbl
   where dt='2022-04-11'
   group by city_id;
   
   -- explain sql: rollup: tbl
   ```
   
   
   
   ### Solution
   
   Can hit rollup.
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
   


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[GitHub] [doris] zenoyang commented on issue #9079: [Enhancement] Cannot hit rollup even if the `if expr` contains the rollup dimension

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

zenoyang commented on issue #9079:
URL: https://github.com/apache/doris/issues/9079#issuecomment-1169524968

   I found that after changing `if` to `case then`, can hit rollup
   
   ```sql
   select city_id,
          count(distinct case WHEN is_intention=1 then device_id end)
   from db1.tbl
   where dt='2022-04-11'
   group by city_id;
   
   -- explain sql: rollup: rollup1
   ```
   
   


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