THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Although Kafka Streams Tutorials contains an example of how distinct
can be emulated, but this example is complicated: it involves low-level coding with local state store and a custom transformer. It might be much more convenient to have distinct
as a first-class DSL operation.
Due to 'infinite' nature of KStream, distinct
operation should be windowed, similar to windowed joins and aggregations for KStreams.
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