[SPARK-8300] DataFrame hint for broadcast join

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.0
• Component/s: SQL
• Target Version/s: 1.5.0
• Sprint: Spark 1.5 doc/QA sprint
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Shepherd: Michael Armbrust
• Created: 10/Jun/15 22:57
• Updated: 23/Jun/15 08:51
• Resolved: 23/Jun/15 08:51

Description

It is not always possible to have perfect cardinality estimation. We should allow users to give hint to the optimizer to do broadcast join.

Issue Links

• links to: [Github] Pull Request #6751 (rxin)