[SPARK-48466] Wrap empty relation propagation in a dedicated node

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0
• Component/s: SQL
• Labels: pull-request-available
• Assignee: Ziqi Liu
• Reporter: Ziqi Liu
• Created: 29/May/24 22:43
• Updated: 02/Jul/24 16:56
• Resolved: 19/Jun/24 08:04

Description

Currently we replace with a LocalTableScan in case of empty relation propagation, which lost the information about the original query plan and make it less human readable. The idea is to create a dedicated `EmptyRelation` node which is a lead node but wraps the original query plan inside.

Issue Links

• links to: GitHub Pull Request #46830
• links to: GitHub Pull Request #47089