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Posted to issues@spark.apache.org by "Liquan Pei (JIRA)" <ji...@apache.org> on 2014/10/08 00:37:33 UTC

[jira] [Created] (SPARK-3839) Reimplement HashOuterJoin to construct hash table of only one relation

Liquan Pei created SPARK-3839:
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             Summary: Reimplement HashOuterJoin to construct hash table of only one relation
                 Key: SPARK-3839
                 URL: https://issues.apache.org/jira/browse/SPARK-3839
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 1.1.0
            Reporter: Liquan Pei


Currently, in HashOuterJoin, we build hash tables for both relations, however, in left/right outer join, we only need to build hash table for one relation. For example, for left hash join, we build a hash table for the right relation and stream the left relation. 



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