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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/06/12 22:02:00 UTC

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

     [ https://issues.apache.org/jira/browse/SPARK-8334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-8334:
-----------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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