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https://issues.apache.org/jira/browse/SPARK-10031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698609#comment-14698609
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Apache Spark commented on SPARK-10031:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/8226
> Join two UnsafeRows in SortMergeJoin if possible
> ------------------------------------------------
>
> Key: SPARK-10031
> URL: https://issues.apache.org/jira/browse/SPARK-10031
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> Currently in SortMergeJoin, when two rows from left and right plans are both
> UnsafeRow, we still use JoinedRow to join them and do an extra
> UnsafeProjection later.
> We can just use GenerateUnsafeRowJoiner to join two UnsafeRows in
> SortMergeJoin if possible. Besides, GenerateUnsafeRowJoiner can have a
> withRight function to only update row2 with a same row1.
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