[jira] [Created] (SPARK-32399) Support full outer join in shuffled hash join and broadcast hash join

["Cheng Su (Jira)" <ji...@apache.org>]

Cheng Su created SPARK-32399:
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             Summary: Support full outer join in shuffled hash join and broadcast hash join
                 Key: SPARK-32399
                 URL: https://issues.apache.org/jira/browse/SPARK-32399
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.1.0
            Reporter: Cheng Su


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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