chunweilei commented on a change in pull request #2146: URL: https://github.com/apache/calcite/pull/2146#discussion_r486827094
########## File path: core/src/main/java/org/apache/calcite/rel/rules/LoptOptimizeJoinRule.java ########## @@ -2064,7 +2064,7 @@ private static boolean areSelfJoinKeysUnique(RelMetadataQuery mq, // are unique. When removing self-joins, if needed, we'll later add an // IS NOT NULL filter on the join keys that are nullable. Therefore, // it's ok if there are nulls in the unique key. - return RelMdUtil.areColumnsDefinitelyUniqueWhenNullsFiltered(mq, leftRel, + return RelMdUtil.areColumnsDefinitelyUnique(mq, leftRel, joinInfo.leftSet()); } Review comment: `RelMdUtil#areColumnsDefinitelyUniqueWhenNullsFiltered` has different implementation from `RelMdUtil#areColumnsDefinitelyUnique`. The former one would ignore null while the other one not. Why do you say they have same behavoirs? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org