Reynold Xin created SPARK-16475:
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Summary: 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
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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