viirya commented on a change in pull request #34034:
URL: https://github.com/apache/spark/pull/34034#discussion_r716897033
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashJoin.scala
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@@ -158,6 +158,17 @@ trait HashJoin extends JoinCodegenSupport {
output, (streamedPlan.output ++
buildPlan.output).map(_.withNullability(true)))
}
+ // Exposed for testing
+ @transient lazy val ignoreDuplicatedKey = joinType match {
+ case LeftExistence(_) =>
+ // For building hash relation, ignore duplicated rows with same join
keys if:
+ // 1. Join condition is empty.
+ // 2. Join condition only references streamed attributes and build join
keys.
Review comment:
We only need to meet any one requirement? So maybe say
```
1. Join condition is empty, or
2. ...
```
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