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https://issues.apache.org/jira/browse/CALCITE-5568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17703569#comment-17703569
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libopeng commented on CALCITE-5568:
-----------------------------------
{code:java}
select ( SELECT 1 ) AS c1
from EMP t1
where EXISTS (select deptno from EMP t2 where t1.deptno=t2.deptno) {code}
Is this?
> Decorrelate will fail. If the RelNode tree has LogicalValues
> ------------------------------------------------------------
>
> Key: CALCITE-5568
> URL: https://issues.apache.org/jira/browse/CALCITE-5568
> Project: Calcite
> Issue Type: Bug
> Reporter: libopeng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Decorrelate will fail. If the RelNode tree has LogicalValues
> case:
> {code:java}
> SELECT
> ( SELECT COUNT(tbl2.deptno) FROM emp AS tbl2 WHERE tbl1.deptno = tbl2.deptno
> ) AS c0,
> ( SELECT 1 ) AS c1
> FROM emp AS tbl1 {code}
> after decorrelate
> (org.apache.calcite.sql2rel.RelDecorrelator#decorrelateQuery(org.apache.calcite.rel.RelNode,
> org.apache.calcite.tools.RelBuilder))
> {code:java}
> LogicalProject(C0=[$9], C1=[$10])
> LogicalJoin(condition=[true], joinType=[left])
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], EXPR$0=[CASE(IS NULL($9),
> 0:BIGINT, $9)])
> LogicalCorrelate(correlation=[$cor0], joinType=[left],
> requiredColumns=[{7}])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{}], EXPR$0=[COUNT()])
> LogicalProject(DEPTNO=[$7])
> LogicalFilter(condition=[=($cor0.DEPTNO, $7)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{}], agg#0=[SINGLE_VALUE($0)])
> LogicalValues(tuples=[[{ 1 }]]){code}
> LogicalCorrelate will not be processed when the RelNode tree has
> LogicalValues
> [https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java#L491]
>
> Is this as expected？
>
>
>
>
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