[FLINK-2830] Add Fold Window Operation for new Windowing API

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 0.10.0
• Component/s: API / DataStream
• Assignee: Aljoscha Krettek
• Reporter: Aljoscha Krettek
• Created: 07/Oct/15 14:52
• Updated: 28/Feb/19 11:14
• Resolved: 07/Oct/15 21:24

Description

We should add a Fold operator to get up to feature parity with the old API.