[FLINK-21026][flink-sql-parser] Align column list specification synta…

[docete]

…x with hive in INSERT statement

What is the purpose of the change

HIVE-9481 allows column list specification in INSERT statement in Hive. And the column list specification appears after the partition clause. Whereas in Flink, the column list specification appears before the partition clause. This PR align the column list specification syntax with Hive.

Brief change log

• 8b36c8a Align column list specification syntax with hive in INSERT statement

Verifying this change

This change is already covered by existing tests

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, 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 8b36c8a (Fri May 28 08:06:29 UTC 2021)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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Review Progress

• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 8b36c8a Azure: SUCCESS

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[JingsongLi]

Thanks @docete for the contribution, looks good to me.