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Posted to issues@spark.apache.org by "Cheng Su (Jira)" <ji...@apache.org> on 2021/09/17 19:00:00 UTC

[jira] [Created] (SPARK-36794) Ignore duplicated join keys when building relation for LEFT/ANTI hash join

Cheng Su created SPARK-36794:
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             Summary: Ignore duplicated join keys when building relation for LEFT/ANTI hash join
                 Key: SPARK-36794
                 URL: https://issues.apache.org/jira/browse/SPARK-36794
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 3.3.0
            Reporter: Cheng Su


For LEFT SEMI and LEFT ANTI hash equi-join without extra join condition, we only need to keep one row per unique join key(s) inside hash table (`HashedRelation`) when building the hash table. This can help reduce the size of hash table of join.



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