[SPARK-21634] Change OneRowRelation from a case object to case class

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.3.0
• Component/s: SQL
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 04/Aug/17 03:39
• Updated: 04/Aug/17 17:39
• Resolved: 04/Aug/17 17:36

Description

OneRowRelation is the only plan that is a case object, which causes some issues with makeCopy using a 0-arg constructor. This patch changes it from a case object to a case class.

This blocks SPARK-21619.

Issue Links

• blocks: SPARK-21619 Fail the execution of canonicalized plans explicitly