[SPARK-24732] Type coercion between MapTypes.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.1
• Fix Version/s: 2.4.0
• Component/s: SQL
• Assignee: Takuya Ueshin
• Reporter: Takuya Ueshin
• Created: 03/Jul/18 08:13
• Updated: 12/Dec/22 18:10
• Resolved: 04/Jul/18 04:22

Description

It seems currently we don't allow type coercion between maps.
We can support type coercion between MapTypes where both the key types and the value types are compatible.

Issue Links

• is related to: SPARK-19536 Improve capability to merge SQL data types
• links to: [Github] Pull Request #21703 (ueshin)