[SPARK-32718] remove unnecessary keywords for interval units

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.0.2, 3.1.0
• Component/s: SQL
• Assignee: Wenchen Fan
• Reporter: Wenchen Fan
• Created: 27/Aug/20 15:40
• Updated: 21/Sep/20 21:07
• Resolved: 29/Aug/20 21:06

Description

We make the internal unit (YEAR, MONTH, etc.) as keywords but it's unnecessary to do so.

Issue Links

• links to: [Github] Pull Request #29560 (cloud-fan)
• links to: [Github] Pull Request #29560 (cloud-fan)
• links to: [Github] Pull Request #29823 (cloud-fan)
• links to: [Github] Pull Request #29823 (cloud-fan)