[FLINK-25614] Let LocalWindowAggregate be chained with upstream

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.14.2
• Fix Version/s: 1.15.0
• Component/s: Table SQL / Runtime
• Labels: pull-request-available
• Assignee: Q Kang
• Reporter: Q Kang
• Created: 11/Jan/22 15:21
• Updated: 29/Jan/22 08:51
• Resolved: 29/Jan/22 08:51

Description

When enabling two-phase aggregation (local-global) strategy for Window TVF, the physical plan is shown as follows:

TableSourceScan -> Calc -> WatermarkAssigner -> Calc
||
|| [FORWARD]
||
LocalWindowAggregate
||
|| [HASH]
||
GlobalWindowAggregate
||
||
...

We can let the `LocalWindowAggregate` node be chained with upstream operators in order to improve efficiency, just like the non-windowing counterpart `LocalGroupAggregate`.

 

Issue Links

• links to: GitHub Pull Request #18331