Zakelly opened a new pull request, #23928:
URL: https://github.com/apache/flink/pull/23928
## What is the purpose of the change
Currently, the TtlValueState#update will wrap the user value with timestamp
and proxy request to the original value state. It does not check the null
value, which violates the description of the base interface. This PR fixes this
by enforcing null value check before wrapping.
## Brief change log
- check the null value before wrapping in TtlValueState#update
## Verifying this change
This change added tests and can be verified as follows:
- Added test case `testValueSetNull` in `TtlStateTestBase.java`, and make
the value of `TtlValueStateTestContext` be `Long` to throw exception when
serializing null.
## 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): **yes**
- 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? **not applicable**
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