[SPARK-29819] Introduce an enum for interval units

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Max Gekk
• Reporter: Max Gekk
• Created: 09/Nov/19 19:58
• Updated: 10/Nov/19 16:42
• Resolved: 10/Nov/19 16:42

Description

Add enum for interval units. This will allow to type check inputs and to avoid typos in interval unit names.

Issue Links

• links to: GitHub Pull Request #26455