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Subject [GitHub] [flink] beyond1920 opened a new pull request #16025: [FLINK-22714][table-planner-blink] Simplify window TVF to a simple window assigner if successor node is WindowRank or WindowJoin.
Date Mon, 31 May 2021 04:13:24 GMT

beyond1920 opened a new pull request #16025:
URL: https://github.com/apache/flink/pull/16025


   ## What is the purpose of the change
   
   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.
   
   The pr introduce a rule to simplify window-tvf.
   
   ## Brief change log
   
     - Introduce `SimplifyWindowTableFunctionRule`
     - Add a flag in `StreamPhysicalWindowTableFunction` to specify whether it is a simplify
window tvf.
   
   ## Verifying this change
   
     - existed UT in `WindowRankTest` and `WindowJoinTest`
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Kubernetes/Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   


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