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https://issues.apache.org/jira/browse/SPARK-32461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li updated SPARK-32461:
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Labels: release-notes (was: )
> Shuffled hash join improvement
> ------------------------------
>
> Key: SPARK-32461
> URL: https://issues.apache.org/jira/browse/SPARK-32461
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Cheng Su
> Priority: Major
> Labels: release-notes
>
> Shuffled hash join avoids sort compared to sort merge join. This advantage
> shows up obviously when joining large table in terms of saving CPU and IO (in
> case of external sort happens). In latest master trunk, shuffled hash join is
> disabled by default with config "spark.sql.join.preferSortMergeJoin"=true,
> with favor of reducing risk of OOM. However shuffled hash join could be
> improved to a better state (validated in our internal fork). Creating this
> Jira to track overall progress.
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