[FLINK-8243] [orc] OrcTableSource reads input path recursively by default.

[fhueske]

What is the purpose of the change

• enable recursive directory enumeration for OrcTableSource (Hive's default behavior)
• expose the configuration in the OrcTableSource builder.

Brief change log

• see purpose above

Verifying this change

• Unit test to validate configuration of FileInputFormat has been added in OrcTableSourceTest.testBuilder()

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, 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? Java docs of builder + web documentation.

[fhueske]

Merging