[FLINK-12794] Support ACC mode for non-window streaming FlatAggregate on Table API

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.9.0
• Component/s: Table SQL / API
• Labels: auto-unassigned pull-request-available
• Assignee: Unassigned
• Reporter: sunjincheng
• Created: 10/Jun/19 09:13
• Updated: 27/Apr/21 23:03

Description

Since the execution of the Stream operator has two modes, `ACC` and `ACCRetract`, users can achieve better performance by implementing special interfaces for streaming. The table below is a quick summary.

	emitValue	emitUpdateWithRetract	emitUpdateWithoutRetract
ACC	Y	N	Y
ACCRetract	Y	Y	N

• emitValue - for batch and streaming.
• eimitUpdateWithRetract - only for streaming in ACC mode(need key definition on TableAggregateFunction, under discussion).
• emitUpdateWithoutRetract - only for streaming in ACCRetract mode.

 In this Jira we will add the ACC mode support for non-window streaming FlatAggregate. the detail can be found in Flip-29

Issue Links

• links to: GitHub Pull Request #8818