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libopeng commented on CALCITE-5880: ----------------------------------- [~shenlang] I agree with the second case. You can try modifying sql. {code:java} select EMPNO from emp where 0 < (select count(*) from dept where emp.EMPNO is not DISTINCT from dept.DEPTNO) {code} In the absence of 'exist', it should still be wrong. > When the association condition of the association subquery is 'is not > distinct from', the join condition becomes '=' after decorrelation. > ----------------------------------------------------------------------------------------------------------------------------------------- > > Key: CALCITE-5880 > URL: https://issues.apache.org/jira/browse/CALCITE-5880 > Project: Calcite > Issue Type: Bug > Reporter: libopeng > Assignee: LakeShen > Priority: Major > Attachments: image-2023-08-01-15-20-22-105.png, > image-2023-08-02-10-15-00-455.png, image-2023-08-13-21-36-00-494.png > > > {code:java} > select EMPNO > from emp > where EXISTS (select DEPTNO from dept where emp.EMPNO is not DISTINCT from > dept.DEPTNO){code} > before decorrelation > {code:java} > LogicalProject(EMPNO=[$0]) > LogicalFilter(condition=[IS NOT NULL($9)]) > LogicalCorrelate(correlation=[$cor0], joinType=[left], > requiredColumns=[{0}]) > LogicalTableScan(table=[[CATALOG, SALES, EMP]]) > LogicalAggregate(group=[{}], agg#0=[MIN($0)]) > LogicalProject($f0=[true]) > LogicalFilter(condition=[OR(AND(IS NULL($cor0.EMPNO), IS NULL($0)), > IS TRUE(=($cor0.EMPNO, $0)))]) <--- here is 't1.x is not distinct from > t2.x' > LogicalTableScan(table=[[CATALOG, SALES, DEPT]]) > {code} > after decorrelation > {code:java} > LogicalProject(EMPNO=[$0]) > LogicalFilter(condition=[IS NOT NULL($9)]) > LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], > SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], $f0=[$13]) > LogicalJoin(condition=[AND(=($0, $11), =($9, $12))], joinType=[left]) > <---here is 't1.x=t2.x and (t1.x is null = t2.x is null)' > LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], > HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], $f9=[false], > EMPNO0=[$0]) > LogicalTableScan(table=[[CATALOG, SALES, EMP]]) > LogicalAggregate(group=[{0, 1}], agg#0=[MIN($2)]) > LogicalProject(EMPNO=[$2], $f9=[$3], $f0=[true]) > LogicalJoin(condition=[=($2, $0)], joinType=[inner]) > LogicalTableScan(table=[[CATALOG, SALES, DEPT]]) > LogicalProject(EMPNO=[$0], $f9=[false]) > LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code} > > {code:java} > EMP | DEPT > +---------+ | +---------+ > | EMPNO | | | DEPTNO | > +---------+ | +---------+ > | null | | | null | > {code} > expect result > {code:java} > EMPNO > +-------+ > | null | > +-------+{code} > actual result > {code:java} > EMPNO > +-------+ > +-------+ {code} > > > -- This message was sent by Atlassian Jira (v8.20.10#820010)