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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2020/09/14 08:51:00 UTC
[jira] [Resolved] (SPARK-32854) Avoid per-row join type check in
stream-stream join
[ https://issues.apache.org/jira/browse/SPARK-32854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan resolved SPARK-32854.
---------------------------------
Fix Version/s: 3.1.0
Resolution: Fixed
Issue resolved by pull request 29724
[https://github.com/apache/spark/pull/29724]
> Avoid per-row join type check in stream-stream join
> ---------------------------------------------------
>
> Key: SPARK-32854
> URL: https://issues.apache.org/jira/browse/SPARK-32854
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.1.0
> Reporter: Cheng Su
> Assignee: Cheng Su
> Priority: Trivial
> Fix For: 3.1.0
>
>
> In stream-stream join (`StreamingSymmetricHashJoinExec`), we can optimize to avoid per row check for join type ([https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinExec.scala#L486-L492] ), to create the method before the loop of reading row. Similar optimization (i.e. create auxiliary method/variable per different join type beforehand) has been done in batch join world (`SortMergeJoinExec`, `ShuffledHashJoinExec`). This is a minor change.
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