[jira] [Created] (CALCITE-2295) Correlated SubQuery with Project will generate error plan

["godfrey he (JIRA)" <ji...@apache.org>]

godfrey he created CALCITE-2295:
-----------------------------------

             Summary: Correlated SubQuery with Project will generate error plan
                 Key: CALCITE-2295
                 URL: https://issues.apache.org/jira/browse/CALCITE-2295
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.15.0
            Reporter: godfrey he
            Assignee: Julian Hyde


test case in *RelOptRulesTest.java*:
{code:java}
@Test public void testDecorrelateWithProject() throws Exception {
    final String sql = "select sal,\n"
                       + "exists (select * from emp_b where emp.deptno = emp_b.deptno)\n"
                       + "from sales.emp";
    checkSubQuery(sql).withLateDecorrelation(true).check();
}
{code}
after *SqlToRelConverter*, the plan is
{code:java}
LogicalProject(SAL=[$5], EXPR$1=[EXISTS({
LogicalFilter(condition=[=($cor0.DEPTNO, $7)])
  LogicalTableScan(table=[[CATALOG, SALES, EMP_B]])
})])
  LogicalTableScan(table=[[CATALOG, SALES, EMP]])
{code}

NOTES: *LogicalProject* does not have any *_variablesSet_* attributes.

the correct plan should be:
{code:java}
LogicalProject(SAL=[$5], EXPR$1=[EXISTS({
LogicalFilter(condition=[=($cor0.DEPTNO, $7)])
  LogicalTableScan(table=[[CATALOG, SALES, EMP_B]])
})], variablesSet=[[$cor0]])
  LogicalTableScan(table=[[CATALOG, SALES, EMP]])
{code}




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