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  1. Calcite
  2. CALCITE-4206

RelDecorrelator outputs wrong plan for correlate sort with fetch limit

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      Description

      For query

      SELECT deptno, ename
        FROM
          (SELECT DISTINCT deptno FROM emp) t1,
            LATERAL (
              SELECT ename, sal
              FROM emp
              WHERE deptno = t1.deptno
              ORDER BY sal
              DESC LIMIT 3
            )
      

      The current plan after decorrelation is

      LogicalProject(DEPTNO=[$0], ENAME=[$1])
        LogicalJoin(condition=[=($0, $3)], joinType=[inner])
          LogicalAggregate(group=[{0}])
            LogicalProject(DEPTNO=[$7])
              LogicalTableScan(table=[[CATALOG, SALES, EMP]])
          LogicalSort(sort0=[$1], dir0=[DESC], fetch=[3])
            LogicalProject(ENAME=[$1], SAL=[$5], DEPTNO=[$7])
              LogicalTableScan(table=[[CATALOG, SALES, EMP]])
      

      which is wrong, because the partition sort(on sal) changes to global.

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              • Assignee:
                danny0405 Danny Chen
                Reporter:
                danny0405 Danny Chen
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