[SPARK-24017] Refactor ExternalCatalog to be an interface

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 2.4.0
• Component/s: SQL
• Target Version/s: 2.4.0
• Assignee: Xiao Li
• Reporter: Xiao Li
• Created: 18/Apr/18 17:58
• Updated: 07/May/18 03:42
• Resolved: 07/May/18 03:42

Description

This refactors the external catalog to be an interface. It can be easier for the future work in the catalog federation.

Issue Links

• is related to: SPARK-23443 Spark with Glue as external catalog
• is related to: SPARK-15777 Catalog federation
• links to: [Github] Pull Request #21122 (gatorsmile)