[SPARK-48465] Avoid no-op empty relation propagation in AQE

• Type: Bug
• 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 21:11
• Updated: 31/May/24 21:02
• Resolved: 31/May/24 21:02

Description

We should avoid no-op empty relation propagation in AQE: if we convert an empty QueryStageExec to empty relation, it will further wrapped into a new query stage and execute -> produce empty result -> empty relation propagation again. This issue is currently not exposed because AQE will try to reuse shuffle.

Issue Links

• links to: GitHub Pull Request #46814