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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2016/07/11 00:35:10 UTC

[jira] [Updated] (SPARK-16475) Broadcast Hint for SQL Queries

     [ https://issues.apache.org/jira/browse/SPARK-16475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-16475:
--------------------------------
    Attachment: BroadcastHintinSparkSQL.pdf

> Broadcast Hint for SQL Queries
> ------------------------------
>
>                 Key: SPARK-16475
>                 URL: https://issues.apache.org/jira/browse/SPARK-16475
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Reynold Xin
>         Attachments: BroadcastHintinSparkSQL.pdf
>
>
> Broadcast hint is a way for users to manually annotate a query and suggest to the query optimizer the join method. It is very useful when the query optimizer cannot make optimal decision with respect to join methods due to conservativeness or the lack of proper statistics.
> The DataFrame API has broadcast hint since Spark 1.5. However, we do not have an equivalent functionality in SQL queries. We propose adding Hive-style broadcast hint to Spark SQL.
> For more information, please see the attached document.



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