[FLINK-33063][table-runtime] Fix udaf with complex user defined pojo object throw error while generate record equaliser

[swuferhong]

What is the purpose of the change

When user create an udaf while recore contains user define complex pojo object (like List or Map). The codegen will throw error while generating record equaliser, the error is:
A method named "compareTo" is not declared in any enclosing class nor any subtype, nor through a static import.

Brief change log

• Add a test to cover the user defined pojo object.

Verifying this change

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: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, 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? no docs

[flinkbot]

CI report:

• d8f3060 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[wuchong]

LGTM.

[wuchong]

@swuferhong could you open a cherry-pick pull request for release-1.18 branch?

[swuferhong]

@swuferhong could you open a cherry-pick pull request for release-1.18 branch?

Sure!