[FLINK-18596] [table] Derive format schema from table schema may get error result

[jrthe42]

What is the purpose of the change

If rowtime attribute references a regular field, derive format schema from table schema may get error result. This pull request fixs this problem.

Verifying this change

This change added tests and can be verified as follows:

• Add test case TableFormatFactoryBaseTest#testSchemaDerivationWithRowtimeFromExistField

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/Mesos, 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 b46daa6 (Mon Jul 20 11:59:52 UTC 2020)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!
• This pull request references an unassigned Jira ticket. According to the code contribution guide, tickets need to be assigned before starting with the implementation work.

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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:

• b46daa6 Azure: FAILURE

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