JingsongLi opened a new pull request #11496: [FLINK-16743][table] Introduce 
datagen, print, blackhole connectors
URL: https://github.com/apache/flink/pull/11496
   ## What is the purpose of the change
   Introduce built-in connectors for better startup, test, production-debug, 
and etc...
   1.datagen source:
   - easy startup/test for streaming job
   - performance testing
   2.print sink:
   - easy test for streaming job
   - be very useful in production debugging
   3.blackhole sink
   - very useful for high performance testing of Flink
   - I've also run into users trying UDF to output, not sink, so they need this 
sink as well.
   ## Brief change log
   - DataGeneratorSource
   - DataGenTableSourceFactory
   - PrintTableSinkFactory
   - BlackHoleTableSinkFactory
   ## Verifying this change
   - `DataGenTableSourceFactoryTest`
   - `TableSinkFactoryTest`
   - `DataGeneratorSourceTest`
   ## 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)
     - If yes, how is the feature documented? (JavaDocs)

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