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https://issues.apache.org/jira/browse/CALCITE-1537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Julian Hyde updated CALCITE-1537:
---------------------------------
Summary: Unnecessary project expression in multi-sub-query plan (was:
Un-necessary project expression in multi-subquery plan)
> Unnecessary project expression in multi-sub-query plan
> ------------------------------------------------------
>
> Key: CALCITE-1537
> URL: https://issues.apache.org/jira/browse/CALCITE-1537
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Vineet Garg
> Assignee: Julian Hyde
> Labels: sub-query
>
> Query
> {code} select sal from emp where empno IN (select deptno from dept where
> emp.job = dept.name) AND empno IN (select empno from emp e where emp.ename =
> e.ename) {code}
> Plan just before calling *SubqueryRemoveRule*
> {code}
> LogicalProject(SAL=[$5])
> LogicalFilter(condition=[AND(IN($0, {
> LogicalProject(DEPTNO=[$0])
> LogicalFilter(condition=[=($cor0.JOB, $1)])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> }), IN($0, {
> LogicalProject(EMPNO=[$0])
> LogicalFilter(condition=[=($cor0.ENAME, $1)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> }))], variablesSet=[[$cor0]])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> Plan just after *SubqueryRemoveRule*
> {code}
> LogicalProject(SAL=[$5])
> 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], DEPTNO0=[$9])
> LogicalJoin(condition=[=($0, $10)], joinType=[inner])
> LogicalFilter(condition=[=($0, $9)])
> LogicalCorrelate(correlation=[$cor0], joinType=[INNER],
> requiredColumns=[{2}])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{0}])
> LogicalProject(DEPTNO=[$0])
> LogicalFilter(condition=[=($cor0.JOB, $1)])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalAggregate(group=[{0}])
> LogicalProject(EMPNO=[$0])
> LogicalFilter(condition=[=($cor0.ENAME, $1)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> Plan just after *decorrelation*
> {code}
> LogicalProject(SAL=[$5], ENAME0=[$9])
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], ENAME0=[$10])
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
> SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], DEPTNO0=[$9], ENAME0=[$12])
> LogicalJoin(condition=[=($0, $11)], joinType=[inner])
> LogicalJoin(condition=[AND(=($2, $10), =($0, $9))], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{0, 1}])
> LogicalProject(DEPTNO=[$0], JOB=[$1])
> LogicalProject(DEPTNO=[$0], JOB=[$2])
> LogicalJoin(condition=[=($2, $1)], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> LogicalAggregate(group=[{0}])
> LogicalProject(JOB=[$2])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{0, 1}])
> LogicalProject(EMPNO=[$0], ENAME0=[$1])
> LogicalProject(EMPNO=[$0], ENAME0=[$9])
> LogicalJoin(condition=[=($9, $1)], joinType=[inner])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalAggregate(group=[{0}])
> LogicalProject(ENAME=[$1])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> As you can notice the top *LogicalProject* has unnecessary expression
> *ENAME0* after decorrelation
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