liyafan82 commented on a change in pull request #2146:
URL: https://github.com/apache/calcite/pull/2146#discussion_r486854367
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File path:
core/src/main/java/org/apache/calcite/rel/rules/LoptOptimizeJoinRule.java
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@@ -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:
@chunweilei Thanks a lot for your careful review. They are different
indeed.
However, `areColumnsDefinitelyUniqueWhenNullsFiltered` methods could be
implemented in a more efficient way.
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