[FLINK-22714] Simplify `StreamPhysicalWindowTableFunction` to a simple window assigner if successor node with `WindowAttachedWindowingStrategy` in planner

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.14.0
• Fix Version/s: 1.14.0
• Component/s: Table SQL / Planner
• Labels: pull-request-available stale-assigned
• Assignee: Jing Zhang
• Reporter: Jing Zhang
• Created: 19/May/21 13:14
• Updated: 27/Jul/21 02:32
• Resolved: 06/Jul/21 08:33

Description

In theory, `StreamPhysicalWindowTableFunction` should works as a window assigner and emits at ends of window. However, `StreamPhysicalWindowTableFunction` could be simplified to a simple window assigner, and emits per record if it's successor node is one of `WindowRank`/`WindowJoin`/`WindowAggregate` with `WindowAttachedWindowingStrategy`, because those nodes would assign input records to windows have been assigned in input nodes, and trigger emit at ends of window.

Besides, we should add a limit that window is based on rowtime, because it has syntax problem if window is assigned based on the proc-time of previous operator.

Issue Links

• links to: GitHub Pull Request #16025