[FLINK-4307] Broken user-facing API for ListState

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 1.1.0, 1.2.0
• Assignee: Stephan Ewen
• Reporter: Stephan Ewen
• Created: 02/Aug/16 16:17
• Updated: 28/Feb/19 11:16
• Resolved: 02/Aug/16 19:47

Description

The user-facing ListState is supposed to return an empty list when no element is contained in the state.

A previous change altered that behavior to make it in the runtime classes accessible whether a ListState is empty.

To not break the user-facing API, we need to restore the behavior for ListState exposed to the users via the RuntimeContext.