[FLINK-21069][table-planner-blink] Configuration "parallelism.default" doesn't take effect for TableEnvironment#explainSql

[SteNicholas]

What is the purpose of the change

The configuration parallelism.default for table environment doesn't take effect for TableEnvironment#explain. Because PlannerBase#translateToRel doesn't invoke overrideEnvParallelism which configures the configuration into underlying StreamExecutionEnvironment and is invoked in translate. Method overrideEnvParallelism should be invoked in translateToRel and removed from translate.

Brief change log

• PlannerBase#translateToRel invokes the method overrideEnvParallelism which configures the configuration into underlying StreamExecutionEnvironment.

Verifying this change

• Modify testStreamTableEnvironmentExecutionExplain of TableEnvironmentTest to verify the test case whether the configuration parallelism.default takes effect in TableEnvironment#explainSql or not.

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)

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Last check on commit 2ce2e5d (Fri May 28 07:13:14 UTC 2021)

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[wuchong]

Compile is failed.

[SteNicholas]

@wuchong, sorry for the failure of scala style compile. I have updated the violation of TableEnvironmentTest. You could help to review.

[wuchong]

LGTM.