hsyuan commented on a change in pull request #2002:
URL: https://github.com/apache/calcite/pull/2002#discussion_r435225707
##########
File path: core/src/main/java/org/apache/calcite/rel/rules/JoinCommuteRule.java
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@@ -145,6 +145,12 @@ public static RelNode swap(Join join, boolean
swapOuterJoins,
.build();
}
+ public boolean matches(RelOptRuleCall call) {
+ Join join = call.rel(0);
+ // SEMI and ANTI join cannot be swapped.
+ return join.getJoinType().projectsRight();
+ }
Review comment:
LOL. 😝
I remembered I created that JIRA but not immediately create a pull request,
because I had to come up with a test case.
The code change looks good to me, but I think we'd better add a test case. :)
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