[GitHub] [calcite] hsyuan commented on a change in pull request #2002: [CALCITE-4042] JoinCommuteRule must not match SEMI / ANTI join

[GitBox <gi...@apache.org>]

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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