[SPARK-3865] Dimension table broadcast shouldn't be eager

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.0
• Component/s: SQL
• Assignee: Shixiong Zhu
• Reporter: Reynold Xin
• Created: 09/Oct/14 00:05
• Updated: 12/Aug/15 05:36
• Resolved: 12/Aug/15 05:36

Description

We eagerly broadcast dimension tables in BroadcastJoin. This is bad because even explain would trigger a job to execute the broadcast.