Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2298
@StephanEwen A user can also call `CsvInputFormat.nextRecord()` because it
is public, but this was never a problem. If we want to restrict visibility of
`TableSource` interface methods, we have to convert the interfaces to classes
and provide 3 class for batch, stream, batch&stream. Also not very nice.
In general, the Scala classes hide the Java API streams and environments
within the Table API. But in this case the user wants to implement a custom
TableSource and since the Table API is internally using the Java API I think it
is ok, if Java API and not Scala API is used for that.
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