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https://issues.apache.org/jira/browse/SPARK-8334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14583980#comment-14583980
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Apache Spark commented on SPARK-8334:
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User 'navis' has created a pull request for this issue:
https://github.com/apache/spark/pull/6790
> 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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