Vancior commented on code in PR #20263:
URL: https://github.com/apache/flink/pull/20263#discussion_r930546050
##########
flink-python/pyflink/datastream/connectors/base.py:
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@@ -52,6 +53,24 @@ def __init__(self, sink: Union[str, JavaObject]):
super(Sink, self).__init__(sink)
+class TransformAppender(ABC):
+
+ @abstractmethod
+ def apply(self, ds):
+ pass
+
+
+class PreTransformWrapper(ABC):
+
+ @abstractmethod
+ def need_pre_transform(self) -> bool:
Review Comment:
This is still needed that a sink implementing `SupportsPreprocessing` may
not require preprocessing, e.g. `KafkaSink` doesn't need preprocessing when
using fixed topic.
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