[SPARK-25096] Loosen nullability if the cast is force-nullable.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.4.0
• Component/s: SQL
• Assignee: Takuya Ueshin
• Reporter: Takuya Ueshin
• Created: 13/Aug/18 03:26
• Updated: 12/Dec/22 18:11
• Resolved: 13/Aug/18 11:27

Description

In type coercion for complex types, if the found type is force-nullable to cast, we should loosen the nullability to be able to cast. Also for map key type, we can't use the type.

Issue Links

• links to: [Github] Pull Request #22086 (ueshin)