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https://issues.apache.org/jira/browse/SPARK-17517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon updated SPARK-17517:
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Labels: bulk-closed (was: )
> 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
> Priority: Major
> Labels: bulk-closed
>
> For current `BroadcastHashJoinExec`, we generate join code for key is not
> unique like this:
> {code:title=processNext.java|borderStyle=solid}
> 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 bulid side row fields to result row
> append(result row)
> }
> {code}
> 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:
> {code:title=processNext.java|borderStyle=solid}
> 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 bulid side row fields to result row
> append(result row)
> }
> {code}
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