hsyuan commented on a change in pull request #1589: [CALCITE-3508] Strengthen
outer Join to inner if it is under a Filter that discards null values
URL: https://github.com/apache/calcite/pull/1589#discussion_r347204296
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File path: core/src/test/resources/org/apache/calcite/test/RelOptRulesTest.xml
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@@ -5397,22 +5397,25 @@ where d.deptno > 7 and e.deptno > 9]]>
<Resource name="planBefore">
<![CDATA[
LogicalProject(EXPR$0=[1])
- LogicalFilter(condition=[>($16, 9)])
Review comment:
By changing outer join to inner join, we get the chance to swap the inner
and outer relation, then we may be able to build hash table on smaller side,
which is a big advantage.
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