[FLINK-3582] Add Iterator over State for All Keys in Partitioned State

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Component/s: API / DataStream
• Assignee: Aljoscha Krettek
• Reporter: Aljoscha Krettek
• Created: 04/Mar/16 14:10
• Updated: 13/Oct/17 16:11
• Resolved: 13/Oct/17 16:11

Description

Having a non-keyed trigger requires that we have a way to iterate over the state for all keys, so that we can emit window results.

This should only be for internal use, but maybe users also want to iterate over the state for all keys.

As a corollary, we then also need a way to drop state for all keys at the same time.