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https://issues.apache.org/jira/browse/SPARK-15365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287067#comment-15287067
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Apache Spark commented on SPARK-15365:
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User 'Parth-Brahmbhatt' has created a pull request for this issue:
https://github.com/apache/spark/pull/13150
> Metastore relation should fallback to HDFS size if statistics are not
> available from table meta data.
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-15365
> URL: https://issues.apache.org/jira/browse/SPARK-15365
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Parth Brahmbhatt
>
> Currently if a table is used in join operation we rely on Metastore returned
> size to calculate if we can convert the operation to Broadcast join. This
> optimization only kicks in for table's that have the statics available in
> metastore. Hive generally rolls over to HDFS if the statistics are not
> available directly from metastore and this seems like a reasonable choice to
> adopt given the optimization benefit of using broadcast joins.
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