[jira] [Resolved] (CALCITE-3256) Add ProjectOnProjectToProjectUnifyRule for materialization matching.

["Jin Xing (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jin Xing resolved CALCITE-3256.
-------------------------------
    Resolution: Duplicate

> Add ProjectOnProjectToProjectUnifyRule for materialization matching.
> --------------------------------------------------------------------
>
>                 Key: CALCITE-3256
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3256
>             Project: Calcite
>          Issue Type: Sub-task
>          Components: core
>            Reporter: Jin Xing
>            Assignee: Jin Xing
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> In current code, below matching fails:
> {code:java}
> MV:
> select deptno, sum(salary) + 2, sum(commission)
> from emps
> group by deptno
> Query:
> select deptno, sum(salary) + 2
> from emps
> group by deptno
> {code}
> The reason is that --  after matching of the Aggregates, a compensating Project is added, but afterwards matching fails to handle it.
> This issue proposes to add a rule that match when query and target are both Project and query has a compensating Project as a child. After this issue below case can be handled:
> {code:java}
> Query:
>     Project(projects: [$0, +($1, 2)])
>       Project(projects: [$1, $3, $4])
>         Rel-A
> Target:  
>     Project(projects: [$1, +($3, 2)])
>       Rel-A
> {code}



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