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https://issues.apache.org/jira/browse/CALCITE-512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14240300#comment-14240300
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Julian Hyde commented on CALCITE-512:
-------------------------------------
Here's an example of multiple expressions:
{code:sql}
select deptno, gender, grouping_id(deptno, gender, deptno), count(*)
from emp
group by cube(gender, deptno)
{code}
If a row represents a rollup of {{deptno}} but not {{gender}} then
{{grouping_id(deptno, gender, deptno)}} evaluates to 5 (binary 101).
> Add GROUP_ID and GROUPING_ID functions
> --------------------------------------
>
> Key: CALCITE-512
> URL: https://issues.apache.org/jira/browse/CALCITE-512
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Implement GROUP_ID and GROUPING_ID(expr [, expr]...) functions, as they are
> defined in Oracle.
> We already have, as of CALCITE-370, the GROUPING(expr) function. Now define
> GROUPING_ID:
> GROUPING_ID(e2, e1, e0)
> == GROUPING(e2) * 4
> + GROUPING(e1) * 2
> + GROUPING(e0)
> and similarly for different numbers of arguments.
> GROUP_ID() is equivalent to GROUPING_ID(x, y, z), where x, y, z are the
> expressions being grouped.
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