[SPARK-27314] Deduplicate exprIds for Union.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Takuya Ueshin
• Reporter: Takuya Ueshin
• Created: 28/Mar/19 08:18
• Updated: 13/May/22 08:33
• Resolved: 29/Mar/19 22:04

Description

We have been having a potential problem with Union when the children have the same expression id in their outputs, which happens when self-union.

Issue Links

• links to: GitHub Pull Request #24236