[FLINK-20464] Some Table examples are not built correctly

[dawidwys]

What is the purpose of the change

Fixes the Table examples that were built incorrectly.

Verifying this change

Run the examples.

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/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)

[twalthr]

LGTM

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Automated Checks

Last check on commit a2ff42c (Thu Dec 03 09:57:48 UTC 2020)

Warnings:

• 1 pom.xml files were touched: Check for build and licensing issues.
• 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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[flinkbot]

CI report:

• a2ff42c Azure: FAILURE

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[rmetzger]

I reported the CI instability in https://issues.apache.org/jira/browse/FLINK-20329