Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1606#issuecomment-182778295
The motivation for this was to to make those Internal which can be added
via the ExecutionEnvironment. Sources that offer configuration parameters which
are not accessible via the ExecutionEnvironment are PublicEvolving.
Does that make sense or should we make all PublicEvolving?
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