Sean Hsuan-Yi Chu created CALCITE-827:
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Summary: ProjectToWindowRule leads to Assertion Error when
multiple windows are used in a specific way
Key: CALCITE-827
URL: https://issues.apache.org/jira/browse/CALCITE-827
Project: Calcite
Issue Type: Bug
Reporter: Sean Hsuan-Yi Chu
Assignee: Sean Hsuan-Yi Chu
To reproduce this issue, add ProjectToWindowRule to the Hep Planner.
Then, a query below would fail with an Assertion Error (type mis-match)
{code}
select count(*) over(partition by empno order by sal) as count1,
count(*) over(partition by deptno order by sal) as count2,
sum(deptno) over(partition by empno order by sal) as sum1
from emp
{code}
However, if the second and third columns are swapped, then it works:
{code}
select count(*) over(partition by empno order by sal) as count1,
sum(deptno) over(partition by empno order by sal) as sum1,
count(*) over(partition by deptno order by sal) as count2
from emp
{code}
Essentially, the window functions which "share the same window definition"
should be placed consecutively in the select-list; Otherwise, the current
linking mechanism seems having some difficulty.
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