[FLINK-1620] Add pre-aggregator for count windows

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9
• Component/s: API / DataStream
• Assignee: Gyula Fora
• Reporter: Gyula Fora
• Created: 02/Mar/15 09:14
• Updated: 28/Feb/19 11:15
• Resolved: 15/Mar/15 17:04

Description

Currently there is only support for pre-aggregators for tumbling policies.

A pre-aggregator should be added for count policies.