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https://issues.apache.org/jira/browse/SPARK-32399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Su updated SPARK-32399:
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Summary: Support full outer join in shuffled hash join (was: Support full
outer join in shuffled hash join and broadcast hash join)
> Support full outer join in shuffled hash join
> ---------------------------------------------
>
> Key: SPARK-32399
> URL: https://issues.apache.org/jira/browse/SPARK-32399
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Cheng Su
> Priority: Minor
>
> Currently for SQL full outer join, spark always does a sort merge join no
> matter of how large the join children size are. Inspired by recent discussion
> in [https://github.com/apache/spark/pull/29130#discussion_r456502678] and
> [https://github.com/apache/spark/pull/29181], I think we can support full
> outer join in shuffled hash join and broadcast hash join in a way that - when
> looking up stream side keys from build side {{HashedRelation}}. Mark this
> info inside build side {{HashedRelation}}, and after reading all rows from
> stream side, output all non-matching rows from build side based on modified
> {{HashedRelation}}. But more design details need to be figured out for this
> JIRA.
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