Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3039
@mushketyk no worries :-)
@wuchong Since the methods are only added when needed by implementing the
interface there is no default implementation. The logic of the default
implementation (calling the static method of `TableEnvironment`) is directly
put into the `TableSourceTable` and only replaced if the table source
implements the new interface.
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