[FLINK-2680] Create a dedicated aligned-event time window operator

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.10.0
• Fix Version/s: 1.0.0
• Component/s: API / DataStream
• Assignee: Stephan Ewen
• Reporter: Stephan Ewen
• Created: 15/Sep/15 12:19
• Updated: 28/Feb/19 11:15
• Resolved: 17/Nov/15 13:24

Description

Aligned event time windows (where every key triggers and evicts in the same way) are the most common case, and should have a dedicated high-performance implementation that supports:

• pre-aggregated state
• non aggregated state