kezhuw opened a new pull request #15507:
URL: https://github.com/apache/flink/pull/15507
## What is the purpose of the change
Respect type customization(eg. `SingleOutputStreamOperator.returns`) for
`FromElementsFunction`.
## Brief change log
* Add test to assert that `AbstractUdfStreamOperator` redirects
`OutputTypeConfigurable` to function
* Postpone `FromElementsFunction` serialization to respect later type
customization
## Verifying this change
This change added tests and can be verified as follows:
* `StreamGraphGeneratorTesttestOutputTypeConfigurationWithUdfStreamOperator`
* `FromElementsFunctionTest`
* Existing tests that using `FromElementsFunction` directly or indirectly.
## 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)`: (**yes**)
- 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)
## **WARNING: possible breaking change**
Previously, `FromElementsFunction` serializes elements eagerly. After this
pr, it serializes elements lazily. Any code which depend on previous behavior
may break. Depends on perspective, this might be treated as a breaking change.
Following are possible affected apis:
* `StreamExecutionEnvironment.fromElements(OUT... data)`
* `StreamExecutionEnvironment.fromElements(Class<OUT> type, OUT... data)`
* `StreamExecutionEnvironment.fromCollection(Collection<OUT> data)`
* `StreamExecutionEnvironment.fromCollection(Collection<OUT> data,
TypeInformation<OUT> typeInfo)`
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