[FLINK-19035] Remove deprecated DataStream#fold() method and all related classes

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.12.0
• Component/s: API / DataStream
• Labels: pull-request-available
• Release Note: The long deprecated (Windowed)DataStream#fold was removed in 1.12. Please use other operations such as e.g. (Windowed)DataStream#reduce that perform better in distributed systems.
• Assignee: Dawid Wysakowicz
• Reporter: Dawid Wysakowicz
• Created: 24/Aug/20 12:29
• Updated: 07/Sep/20 10:36
• Resolved: 07/Sep/20 10:36

Description

We should also agree if we want to remove those in 1.x version already or do we want to wait for 2.0.

We should remove DataStream#fold and all related classes and methods such as FoldFunction, FoldingState, FoldingStateDescriptor ...

Issue Links

• links to: GitHub Pull Request #13320