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https://issues.apache.org/jira/browse/CALCITE-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15945925#comment-15945925
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Vineet Garg commented on CALCITE-1726:
--------------------------------------
This particular query has a subquery in FILTER which has another subquery in
PROJECT. Calcite first fires SubqueryRemoveRule::PROJECT which looks for
subquery in PROJECT, it skips the subquery since it is inside FILTER. Next
SubqueryRemoveRule::FILTER is fired which transforms the subquery in FILTER
leaving subquery in PROJECT untransformed.
> Subquery in FILTER is left untransformed
> -----------------------------------------
>
> Key: CALCITE-1726
> URL: https://issues.apache.org/jira/browse/CALCITE-1726
> Project: Calcite
> Issue Type: Bug
> Reporter: Vineet Garg
> Assignee: Julian Hyde
>
> Reproducer
> Query:
> {code:SQL}
> select * from emp
> where empno IN (select (select max(sal) from emp) from dept)
> {code}
> Plan after {{SubqueryRemoveRule}}
> {code:SQL}
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
> LogicalJoin(condition=[=($0, $9)], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{0}])
> LogicalProject(EXPR$0=[$SCALAR_QUERY({
> LogicalAggregate(group=[{}], EXPR$0=[MAX($0)])
> LogicalProject(SAL=[$5])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> })])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> {code}
> As you can notice scalar query in LogicalProject is left as it is
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