[FLINK-26295][table] Operation strategies should allow having spaces …

[snuyanzin]

What is the purpose of the change

The PR allows to have spaces between sql client command and semicolon like it was before #18363

e.g.

HELP ;
QUIT ;

Now it fails as described in FLINK-26295

Brief change log

Added spaces support in Operations

Verifying this change

There is a new test org.apache.flink.table.planner.operations.SqlToOperationConverterTest#testSqlClientCommands

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? (not applicable)

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Automated Checks

Last check on commit 7a77458 (Tue Feb 22 11:53:16 UTC 2022)

Warnings:

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• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
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• ❓ 5. Overall code [quality] is good.

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CI report:

• 216906e Azure: SUCCESS

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[snuyanzin]

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[snuyanzin]

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[snuyanzin]

@slinkydeveloper thank you for your feedback, I addressed all the comments.
Please have a look once you have time.
Please let me know if I need to squash commits

[snuyanzin]

@godfreyhe sorry for the poke...
could you please have a look since it is already approved and it is related to #18363