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https://issues.apache.org/jira/browse/CALCITE-7000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-7000:
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Labels: pull-request-available (was: )
> Extend IntersectToSemiJoinRule to support n-way inputs
> ------------------------------------------------------
>
> Key: CALCITE-7000
> URL: https://issues.apache.org/jira/browse/CALCITE-7000
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zhen Chen
> Assignee: Zhen Chen
> Priority: Minor
> Labels: pull-request-available
>
> SQL:
> {code:java}
> select ename from emp where deptno = 10
> intersect
> select ename from emp where deptno = 20
> intersect
> select ename from emp where deptno = 30 {code}
> Plan before:
> {code:java}
> LogicalIntersect(all=[false])
> LogicalProject(ENAME=[$1])
> LogicalFilter(condition=[=($7, 10)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalProject(ENAME=[$1])
> LogicalFilter(condition=[=($7, 20)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalProject(ENAME=[$1])
> LogicalFilter(condition=[=($7, 30)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
> Plan after:
> {code:java}
> LogicalAggregate(group=[{0}])
> LogicalJoin(condition=[IS NOT DISTINCT FROM($0, $1)], joinType=[semi])
> LogicalJoin(condition=[IS NOT DISTINCT FROM($0, $1)], joinType=[semi])
> LogicalProject(ENAME=[$1])
> LogicalFilter(condition=[=($7, 10)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalProject(ENAME=[$1])
> LogicalFilter(condition=[=($7, 20)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalProject(ENAME=[$1])
> LogicalFilter(condition=[=($7, 30)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
> The number of inputs needs to be greater than 1.
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