liuml07 opened a new pull request, #28179:
URL: https://github.com/apache/flink/pull/28179

   ## What is the purpose of the change
   
   **This backports PR #28149 to `release-2.1` for FLINK-39672**
   
   Adapted for release-1.20: drop the older one-liner about Java records 
introduced in 10157ff4545, which is now superseded by the more detailed 
POJO-types description added by this commit.
   
   Java records have been supported as POJO types since Flink 1.19 
(FLINK-32380), but the only doc mention lived on the release-1.20 
java_compatibility page and was inadvertently removed on master by FLINK-37339.
   
   ## Brief change log
   
   - Restores the FLINK-32380 reference under "Java 17" in 
java_compatibility.md and notes that records are handled as POJO types 
serialized via their canonical constructor.
   - Adds a note in both POJO listings in types_serialization.md that a public 
record class is serialized by PojoSerializer; the no-argument constructor and 
getter/setter requirements do not apply.
   - Mentions in schema_evolution.md that records follow the same POJO schema 
evolution rules.
   
   Parallel updates in docs/content.zh.
   
   ## Verifying this change
   
   Doc-only change.
   
   ## 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, 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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   Generated-by: Claude Opus 4.7


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