[jira] [Resolved] (CALCITE-4333) The Sort rel should be decorrelated even though it has fetch or limit when its parent is not a Correlate

["Danny Chen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Danny Chen resolved CALCITE-4333.
---------------------------------
    Resolution: Fixed

Fixed in [74785aa|https://github.com/apache/calcite/commit/74785aae40cdb48b02e4b8ef885e897c74bf629f] ~

> The Sort rel should be decorrelated even though it has fetch or limit when its parent is not a Correlate
> --------------------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-4333
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4333
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.26.0
>            Reporter: Danny Chen
>            Assignee: Danny Chen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.27.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Check this test in SqlToRelConverterTest:
> {code:java}
> @Test void testSortLimitWithCorrelateInput() {
>     final String sql = "" +
>         "SELECT deptno, ename\n" +
>         "    FROM\n" +
>         "        (SELECT DISTINCT deptno FROM emp) t1,\n" +
>         "          LATERAL (\n" +
>         "            SELECT ename, sal\n" +
>         "            FROM emp\n" +
>         "            WHERE deptno = t1.deptno)\n" +
>         "    ORDER BY ename DESC\n" +
>         "    LIMIT 3";
>     sql(sql).ok();
>   }
> {code}
> The current plan is:
> {code:xml}
> LogicalSort(sort0=[$1], dir0=[DESC], fetch=[3])
>   LogicalProject(DEPTNO=[$0], ENAME=[$1])
>     LogicalCorrelate(correlation=[$cor0], joinType=[inner], requiredColumns=[{0}])
>       LogicalAggregate(group=[{0}])
>         LogicalProject(DEPTNO=[$7])
>           LogicalTableScan(table=[[CATALOG, SALES, EMP]])
>       LogicalProject(ENAME=[$1], SAL=[$5])
>         LogicalFilter(condition=[=($7, $cor0.DEPTNO)])
>           LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> It actually can be decorrelated to:
> {code:xml}
> LogicalSort(sort0=[$1], dir0=[DESC], fetch=[3])
>   LogicalProject(DEPTNO=[$0], ENAME=[$1])
>     LogicalJoin(condition=[=($0, $3)], joinType=[inner])
>       LogicalAggregate(group=[{0}])
>         LogicalProject(DEPTNO=[$7])
>           LogicalTableScan(table=[[CATALOG, SALES, EMP]])
>       LogicalProject(ENAME=[$1], SAL=[$5], DEPTNO=[$7])
>         LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}



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