godfreyhe opened a new pull request #15164:
URL: https://github.com/apache/flink/pull/15164
## What is the purpose of the change
*This pr aims to introduce StateDeclaration which could let the planner know
the state description for an operator, and support json
serialization/deserialization for the states in StreamExecGroupAggregate*
## Brief change log
- *Support StreamExecMiniBatchAssigner json serialization/deserialization*
- *Introduce StateDeclaration which could let the planner know the state
description for an operator*
- *Support json serialization/deserialization for the states in
StreamExecGroupAggregate*
- *Add test for state evolution in an ExecNode*
## Verifying this change
This change added tests and can be verified as follows:
- *Extended GroupAggregateJsonPlanTest which could verify the state
structure used in StreamExecGroupAggregate*
- *Added DistinctJsonPlanTest and MultipleVersionOperatorITCase to verify
the state evolution for an operator in a test ExecNode*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ **not documented**)
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