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https://issues.apache.org/jira/browse/CALCITE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482397#comment-17482397
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xiong duan commented on CALCITE-4683:
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Hi [~yanjing.wang]. Please find a more easy SQL to describe the issue, If it
exists. The Before Plan is not complete?
> In-list to join causes field datatypes not matched
> --------------------------------------------------
>
> Key: CALCITE-4683
> URL: https://issues.apache.org/jira/browse/CALCITE-4683
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.26.0, 1.27.0
> Environment: jdk8
>
> Reporter: yanjing.wang
> Assignee: yanjing.wang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The sql query is
> {code:java}
> SELECT * FROM (SELECT '20210101' AS dt, deptno, max(cast(deptno2 as
> varchar(200))) as m FROM (SELECT emp.deptno as deptno, dept.deptno as deptno2
> FROM emp
> JOIN dept on emp.deptno = dept.deptno) tmp GROUP BY deptno) WHERE cast(deptno
> as
> varchar) in ('1', '3', '5')
> {code}
> When Calcite converts the in list to a join, the original relational algebra
> root will be replaced by a new project, for example
> When we set InSubQueryThreshold value to 2, then the relational algebra tree
> will be converted from
> {code:java}
> LogicalProject(DT=['20210101'], DEPTNO=[$0], M=[$1])
> LogicalAggregate(group=[{0}], M=[MAX($1)])
> LogicalProject(DEPTNO=[$7], $f1=[CAST($9):VARCHAR(200) NOT NULL])
> LogicalJoin(condition=[=($7, $9)], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> {code}
> to
> {code:java}
> LogicalJoin(condition=[=($3, $4)], joinType=[inner])
> LogicalProject(DT=['20210101'], DEPTNO=[$0], M=[$1],
> DEPTNO0=[CAST($0):VARCHAR NOT NULL])
> LogicalAggregate(group=[{0}], M=[MAX($1)])
> LogicalProject(DEPTNO=[$7], $f1=[CAST($9):VARCHAR(200) NOT NULL])
> LogicalJoin(condition=[=($7, $9)], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalAggregate(group=[{0}])
> LogicalValues(tuples=[[{ '1' }, { '3' }, { '5' }]])
> {code}
> We can see that LogicalProject(DT=['20210101'], DEPTNO=[$0], M=[$1]) with
> leaves being true has been replaced by LogicalProject(DT=['20210101'],
> DEPTNO=[$0], M=[$1], DEPTNO0=[CAST($0):VARCHAR NOT NULL]) with leaves being
> false.
> Finally, the query results java.lang.AssertionError: Conversion to relational
> algebra failed to preserve datatypes.
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