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The advantage of this approach that the feature can be used by all connectors without we having to change the implementation (e.g. KafkaSourceBuilder, PulsarSourceBuilder) of individual connectors. Thus it improves the connector developers' experience.

The disadvantage of this approach is that it requires users to pass some source configuration via StreamExecutionEnvironment::fromSource(...) and some other source configuration via e.g. KafkaSourceBuilder(...). This might create a sense of inconsistency/confusion for connectors' users.

Given that the number of connector users are much more than the number of connector developers, it is probably better to optimize the user experience in this case.

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