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https://issues.apache.org/jira/browse/SPARK-17517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15486335#comment-15486335
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Apache Spark commented on SPARK-17517:
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User 'yaooqinn' has created a pull request for this issue:
https://github.com/apache/spark/pull/15071
> Improve generated Code for BroadcastHashJoinExec
> ------------------------------------------------
>
> Key: SPARK-17517
> URL: https://issues.apache.org/jira/browse/SPARK-17517
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Kent Yao
> Fix For: 2.1.0
>
>
> For current `BroadcastHashJoinExec`, we generate join code for key is not
> unique like this:
> ```java
> while (matches.hasnext)
> matched = matches.next
> check and read stream side row fields
> check and read build side row fieldes
> reset result row
> write stream side row fields to result row
> write stream side row fields to result row
> ```
> For some cases, we don't need to check/read/write the steam side repeatedly
> in such while circle, e.g. `Inner Join with BuildRight`, or `BuildLeft &&
> all left side fields are fixed length` and so on. we may generate the code as
> below:
> ```java
> check and read stream side row fields
> reset result row
> write stream side row fields to result row
> while (matches.hasnext)
> matched = matches.next
> check and read build side row fieldes
> write stream side row fields to result row
> ```
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