[ https://issues.apache.org/jira/browse/CALCITE-7071 ]
weihua zhang deleted comment on CALCITE-7071:
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was (Author: JIRAUSER307426):
similar to
[https://github.com/apache/spark/blob/bde09039fb2f26eea996733bab11182440d7bbc7/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/joins.scala#L158]
?
> Support replacing JOIN node with its child node when JOIN condition is false
> in ProjectJoinRemoveRule
> -----------------------------------------------------------------------------------------------------
>
> Key: CALCITE-7071
> URL: https://issues.apache.org/jira/browse/CALCITE-7071
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zhen Chen
> Assignee: Zhen Chen
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.41.0
>
>
> SQL
> {code:java}
> SELECT e.deptno
> FROM sales.emp e
> LEFT JOIN sales.dept d ON e.deptno = d.deptno and e.deptno between 3 and 1
> {code}
> Plan before
> {code:java}
> LogicalProject(DEPTNO=[$7])
> LogicalJoin(condition=[false], joinType=[left])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
> {code}
> Plan after
> {code:java}
> LogicalProject(DEPTNO=[$7])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> In ProjectJoinRemoveRule, when the Join condition is false, replace the Join
> with its left child for a left join or its right child for a right join. The
> above is an example of a left join.
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