[FLINK-10230][table] Support 'SHOW CREATE VIEW' syntax to print the query of a view

[RocMarshal]

What is the purpose of the change

Support 'SHOW CREATE VIEW' syntax to print the query of a view

Brief change log

Support 'SHOW CREATE VIEW' syntax to print the query of a view

Verifying this change

This change added tests and can be verified as follows:

• org.apache.flink.table.planner.catalog.CatalogViewITCase

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, Kubernetes/Yarn, 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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Last check on commit 3af1ce2 (Fri Sep 24 12:55:28 UTC 2021)

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CI report:

• c904e97 Azure: SUCCESS

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[RocMarshal]

@Airblader @wuchong Thank you for your comments. I made some changes based on your suggestions. Please let me know what's your opinion.

[Airblader]

Thanks, this is looking much better already! I think we could maybe make a few more changes. What do you think?

[RocMarshal]

@flinkbot run azure

[RocMarshal]

@Airblader Thank you so much for your suggestions. I updated the pr. PTAL.

[Airblader]

Thanks @RocMarshal! This looks largely good to me now, minus a couple more comments of which most are nits. We'll need a committer to look at this now.

[RocMarshal]

Thanks @Airblader for the review.
Hi, @wuchong , @xintongsong @twalthr @rmetzger @pnowojski @fsk119 . Could you help me to merge it if there are nothing inappropriate ? Thank you.

[wuchong]

Thanks for the great contribution @RocMarshal and sorry for the late reviewing.
I left some comments.

[RocMarshal]

@wuchong I really appreciate it. I make some change based on your suggestions. PTAL.

[wuchong]

Thanks for the updating. I will help to rebase and merge it.