[IMPALA-9256] Refactor constraint information into a separate class.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 3.4.0
• Component/s: Frontend
• Epic Color: ghx-label-3
• Assignee: Anurag Mantripragada
• Reporter: Anurag Mantripragada
• Created: 16/Dec/19 23:01
• Updated: 16/Feb/20 20:33
• Resolved: 16/Feb/20 20:33

Description

We recently added support for primary keys and foreign keys information for tables. However, it is cleaner to have an SQLConstraint class as a container for these constraints just like hive does here: https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/ddl/table/constraint/Constraints.java.

This can be extended to support other kinds of constraints in the future.