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Posted to issues@spark.apache.org by "Takeshi Yamamuro (Jira)" <ji...@apache.org> on 2020/08/16 23:09:00 UTC
[jira] [Resolved] (SPARK-32399) Support full outer join in shuffled
hash join
[ https://issues.apache.org/jira/browse/SPARK-32399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Takeshi Yamamuro resolved SPARK-32399.
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Fix Version/s: 3.1.0
Assignee: Cheng Su
Resolution: Fixed
Resolved by https://github.com/apache/spark/pull/29342
> 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
> Assignee: Cheng Su
> Priority: Minor
> Fix For: 3.1.0
>
>
> 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 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}}.
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