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https://issues.apache.org/jira/browse/CALCITE-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604842#comment-14604842
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Aman Sinha commented on CALCITE-777:
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It seems a more generic issue with nullability. Even without aggregation or
window function, the following subquery's column x is nullable, so we cannot
drop the IS NOT NULL filter in the outer query block.
{code}
select x from (select sal as x from emp where sal is null) where x is not null;
{code}
{code}
LogicalProject(X=[$0])
LogicalProject(X=[$5])
LogicalFilter(condition=[IS NULL($5)])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
{code}
> IS NOT NULL filter is incorrectly dropped for aggregates and window functions
> -----------------------------------------------------------------------------
>
> Key: CALCITE-777
> URL: https://issues.apache.org/jira/browse/CALCITE-777
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.3.0-incubating
> Reporter: Aman Sinha
> Assignee: Julian Hyde
>
> The below plans show the IS NOT NULL filter is incorrectly dropped.
> {code}
> select wsum from (select sum(sal) over (partition by deptno) as wsum from
> emp) where wsum is not null;
> LogicalProject(WSUM=[$0])
> LogicalProject(WSUM=[SUM($5) OVER (PARTITION BY $7 RANGE BETWEEN UNBOUNDED
> PRECEDING AND UNBOUNDED FOLLOWING)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> {code}
> select wsum from (select sum(sal) as wsum from emp group by deptno) where
> wsum is not null;
> LogicalProject(WSUM=[$0])
> LogicalProject(WSUM=[$1])
> LogicalAggregate(group=[{0}], WSUM=[SUM($1)])
> LogicalProject(DEPTNO=[$7], SAL=[$5])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
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