HQL Unions

Description

Add the ability to define unions in HQL. Support will be initially limited to only:
1) scalar queries : select id from Animal union select id from Car
2) the same entity : from Animal where ... union from Animal where ...

Support both UNION and UNION ALL

Environment

None

Status

Assignee

Steve Ebersole

Reporter

Steve Ebersole

Fix versions

Labels

None

backPortable

None

Suitable for new contributors

None

Requires Release Note

None

Pull Request

None

backportDecision

None

Components

Priority

Major