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Posted to issues@spark.apache.org by "Navis (JIRA)" <ji...@apache.org> on 2015/06/12 21:43:00 UTC

[jira] [Created] (SPARK-8334) Binary logical plan should provide more realistic statistics

Navis created SPARK-8334:
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             Summary: Binary logical plan should provide more realistic statistics
                 Key: SPARK-8334
                 URL: https://issues.apache.org/jira/browse/SPARK-8334
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Navis
            Priority: Minor


Currently, spark-sql multiplies size of two children for output size, which makes   following join hash the other side of input. In multi way joins something like (A join B) join C, C  will be marked as 'buildHash' target if size of C is not bigger than (size of A * size of B). Some results of TPC-H queries are greatly affected by this.



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