[FLINK-14258][table][filesystem] Integrate file system connector to streaming sink

[JingsongLi]

What is the purpose of the change

Integrate file system connector to streaming sink.

Brief change log

• Integrate streaming file sink in FileSystemTableSink
• Add ROLLING_POLICYs

Verifying this change

• FsStreamingSinkCsvITCaseBase
• ParquetFsStreamingSinkITCase

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): (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? (yes)
• If yes, how is the feature documented? JavaDocs

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Automated Checks

Last check on commit 90fa0d2 (Fri Apr 17 13:33:53 UTC 2020)

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[leonardBang]

Thank you @JingsongLi for the contribution, generally LGTM, left some minor comments.

[leonardBang]

This note looks like strange, I cannot the meaning..

[JingsongLi]

Sorry for out of date comments, should be:

Table {@link RollingPolicy}, it extends {@link CheckpointRollingPolicy} for bulk writers.

[leonardBang]

we can move the judgement to the begin to make the code path short

[JingsongLi]

Good catch.

if (partitionSpec.isEmpty()) {
  return "";
}

[JingsongLi]

Thanks @leonardBang for the review, merging...