This PR fix a bug in StreamScan and BatchScan, when converting the DataStream 
or DataSet.

When checking the equality of `inputType` and `internalType`, we should compare 
both filed types and field names.

## 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, 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)


[ Full content available at: https://github.com/apache/flink/pull/6666 ]
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