[FLINK-27374][hive] Fix using wrong Flink type for Hive's void type

[luoyuxia]

What is the purpose of the change

Convert Hive's void type to Flink's string type to handle the cases that some Hive's udf may return void type which isn't support by Flink. We can mapping it to Flink's string type.

Brief change log

• Mapping Hive's void type to Flink's string type in HiveTypeUtil.java#toFlinkPrimitiveType like what has been done in HiveInspectors#getObjectInspectorForPrimitiveConstant.

Verifying this change

Addition query select nvl(null, null) in HiveDialectQueryITCase.java#testAdditionalQueries

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, 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? N/A

[flinkbot]

CI report:

• 306bcb9e30977e665067841c2ee588ec1519ca57 Azure: SUCCESS

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[luoyuxia]

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