RupengWang commented on pull request #1024:
URL: https://github.com/apache/kylin/pull/1024#issuecomment-643742229
## Design test cases
### Prepare test env
- create cube and build segment (2012-01-01 ~ 2013-01-01)
- dimension : LSTG_FORMAT_NAME, ops_region, part_dt
- measure : sum(price)
### Case-1
Make sure query-1 and query-2 has the same result.
- query-1 (Hive)
```sql
select LSTG_FORMAT_NAME, stddev_pop(SUM_M)
from (
select LSTG_FORMAT_NAME, ops_region, sum(price) as SUM_M
from KYLIN_SALES
where part_dt >= '2012-01-01' and part_dt < '2012-06-01'
group by LSTG_FORMAT_NAME, ops_region
) a
group by LSTG_FORMAT_NAME
order by LSTG_FORMAT_NAME
```
- query-2 (Kylin)
```sql
select LSTG_FORMAT_NAME, stddev_sum(ops_region, price)
from KYLIN_SALES
where part_dt >= '2012-01-01' and part_dt < '2012-06-01'
group by LSTG_FORMAT_NAME
order by LSTG_FORMAT_NAME
```
### Case-2
Make sure query-1 and query-2 has the same result.
- query-1 (Hive)
```sql
select stddev_pop(SUM_M)
from (
select LSTG_FORMAT_NAME, ops_region, sum(price) as SUM_M
from KYLIN_SALES
where part_dt >= '2012-01-01' and part_dt < '2012-06-01'
group by LSTG_FORMAT_NAME, ops_region
) a
```
- query-2(Kylin)
```sql
select stddev_sum(ops_region, price)
from KYLIN_SALES
where part_dt >= '2012-01-01' and part_dt < '2012-06-01'
```
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