[jira] [Updated] (CALCITE-841) Redundant windows when window function arguments are expressions

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-841:
--------------------------------
    Summary: Redundant windows when window function arguments are expressions  (was: When the argument of window functions is an expression, redundant windows could be generated)

> Redundant windows when window function arguments are expressions
> ----------------------------------------------------------------
>
>                 Key: CALCITE-841
>                 URL: https://issues.apache.org/jira/browse/CALCITE-841
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Sean Hsuan-Yi Chu
>            Assignee: Julian Hyde
>
> Firstly of all, this issue happens when HepPlanner is used with ProjectToWindowRule.PROJECT rule.
> A query with this pattern:
> {code}
> select fn(col) over w, fn(expr) over w
> from ...
> {code}
> will generate two "LogicalWindow" even if we have only an identical window frame.
> For example, 
> {code}
> select sum(deptno) over(partition by deptno order by sal) as sum1, 
> sum(deptno + deptno) over(partition by deptno order by sal) as sum2
> from emp
> {code}
> gives:
> {code}
> LogicalProject($0=[$2], $1=[$4])
>   LogicalWindow(window#0=[window(partition {1} order by [0] range between UNBOUNDED PRECEDING and CURRENT ROW aggs [SUM($3)])])
>     LogicalProject(SAL=[$0], DEPTNO=[$1], $2=[$2], $3=[+($1, $1)])
>       LogicalProject(SAL=[$5], DEPTNO=[$7], $2=[$9])
>         LogicalWindow(window#0=[window(partition {7} order by [5] range between UNBOUNDED PRECEDING and CURRENT ROW aggs [SUM($7)])])
>           LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}



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