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https://issues.apache.org/jira/browse/CALCITE-2295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16469749#comment-16469749
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Vineet Garg commented on CALCITE-2295:
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[~julianhyde] Does *SqlToRelConverter* not support correlated subquery in
project? I looked at code *SqlToRelConverter::convertSelectList* and I don't
see Calcite handling case for correlation subquery expressions.
> 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
> Priority: Critical
>
> 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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