[SPARK-30829] Define LegacyBehaviorPolicy enumeration as the common value for result change configs

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Yuanjian Li
• Reporter: Yuanjian Li
• Created: 14/Feb/20 09:06
• Updated: 18/Feb/20 02:09
• Resolved: 17/Feb/20 17:04

Description

During API auditing for the 3.0 release, we found several new approaches that will change the results silently. For these features, we create a common config value, which is a three-value enumeration. Whenever the new behavior will silently change the results, this config can be reused.

• Exception(default): Spark will throw an exception while result changes will happen, and remind users to choose between legacy and new behavior.
• New Behavior: Use the new approach.
• Legacy: Use the legacy behavior of earlier versions.

Issue Links

• links to: GitHub Pull Request #27579