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https://issues.apache.org/jira/browse/SPARK-32420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17164113#comment-17164113
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Apache Spark commented on SPARK-32420:
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User 'c21' has created a pull request for this issue:
https://github.com/apache/spark/pull/29216
> Add handling for unique key in non-codegen hash join
> ----------------------------------------------------
>
> Key: SPARK-32420
> URL: https://issues.apache.org/jira/browse/SPARK-32420
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Cheng Su
> Priority: Trivial
>
> `HashRelation` has two separate code paths for unique key look up and
> non-unique key look up E.g. in its subclass
> `UnsafeHashedRelation`([https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala#L144-L177]),
> unique key look up is more efficient as it does not have extra
> `Iterator[UnsafeRow].hasNext()/next()` overhead per row.
> `BroadcastHashJoinExec` has handled unique key vs non-unique key separately
> in code-gen path
> ([https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/BroadcastHashJoinExec.scala#L289-L321]).
> But the non-codegen path for broadcast hash join and shuffled hash join do
> not separate it yet, so adding the support here.
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