[
https://issues.apache.org/jira/browse/CALCITE-5156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730318#comment-17730318
]
Julian Hyde commented on CALCITE-5156:
--------------------------------------
Optimizing "CAST(e AS t) IS NOT NULL" to "e IS NOT NULL" seems like a useful
simplification. Similarly IS NULL. So, yes, please log it, even if you don't
have time to fix it.
> Support implicit number type cast for IN Sub-query
> --------------------------------------------------
>
> Key: CALCITE-5156
> URL: https://issues.apache.org/jira/browse/CALCITE-5156
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.30.0
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The SQL:
> {code:java}
> select * from dept where deptno + 20 in (select deptno from dept);{code}
> Calcite returns the wrong answer.
> but the SQL
>
> {code:java}
> select * from dept where deptno + 20 in (select cast(deptno as integer) from
> dept);{code}
> Calcite returns the correct answer.
> So when we generate the RelNode, we can add the type cast.
> Before the type cast:
> {noformat}
> LogicalProject(DEPTNO=[$0], DNAME=[$1], LOC=[$2])
> LogicalFilter(condition=[IN(+($0, 20), {
> LogicalProject(DEPTNO=[$0])
> LogicalTableScan(table=[[scott, DEPT]])
> })])
> LogicalTableScan(table=[[scott, DEPT]]){noformat}
> After the type cast:
> {noformat}
> LogicalProject(DEPTNO=[$0], DNAME=[$1], LOC=[$2])
> LogicalFilter(condition=[IN(+($0, 20), {
> LogicalProject(EXPR$0=[CAST($0):INTEGER NOT NULL])
> LogicalTableScan(table=[[scott, DEPT]])
> })])
> LogicalTableScan(table=[[scott, DEPT]]){noformat}
> Same SQL includes:
> {code:java}
> select *
> from dept
> where deptno in (select sal-780 from emp){code}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
