Yerui Sun created KYLIN-1921:
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Summary: Support Grouping Funtions
Key: KYLIN-1921
URL: https://issues.apache.org/jira/browse/KYLIN-1921
Project: Kylin
Issue Type: New Feature
Components: Query Engine
Affects Versions: v1.5.4
Reporter: Yerui Sun
Assignee: Yerui Sun
Usually we used 'group by dim1, dim2' to fetch the metrics with every value of
dims, and we also want the summary metrics with the dim2 rolled up.
This case could be resolved by union two query, like:
{code}
select dim1, dim2 metric from table group by dim1, dim2
union all
select dim1, 'ALL', metric from table group by dim1
{code}
Now with the expression cube/rollup/grouping sets in calcite, we can make the
query sql more simple and more clearly:
{code}
select dim1, case(grouping(dim2) when 1 then 'ALL' else dim2 end)
from table
group by grouping sets((dim1, dim2), (dim1))
{code}
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