[FLINK-16535] [table] BatchTableSink#emitDataSet returns DataSink

[godfreyhe]

What is the purpose of the change

BatchTableSink#emitDataSet returns DataSink, and BatchTableEnvironment can generate Plan based on those DataSinks. This is an incompatible change, the existing BatchTableSinks should add return value for emitDataSet method.

Brief change log

• add return value for BatchTableSink#emitDataSet

Verifying this change

This change is already covered by existing tests, such as org.apache.flink.table.catalog.CatalogTableITCase, org.apache.flink.table.api.TableEnvironmentITCase, etc. *

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 / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit a737faf (Wed Mar 11 08:48:00 UTC 2020)

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[godfreyhe]

@JingsongLi could you help to review this pr? thx

[JingsongLi]

consumeDataSet?

[godfreyhe]

consumeDataSet?

agree, although the change is a little larger. consumeDataSet aligns with consumeDataStream

[JingsongLi]

Looks good to me.