yanjing.wang created CALCITE-4683:
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Summary: In-list to join with new project generated cause replaced
root leaves property to be missing
Key: CALCITE-4683
URL: https://issues.apache.org/jira/browse/CALCITE-4683
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.27.0, 1.26.0
Environment: jdk8
Reporter: yanjing.wang
When Calcite converts a in list to a join, the original relational algebra root
may be replaced by a new project, for example
{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 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leaves being true has been replaced by LogicalProject(DT=['20210101'],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.
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