1050. KTable - dkkahm/study-kafka-with-spring GitHub Wiki
groupByKey and aggregation
groupBy and aggregation
feedbackStreams[0].groupBy((key, value) -> value).count()
topic as KTable
flashSaleVoteStream.to("t.commodity.flashsale-vote-user-item");
builder.table("t.commodity.flashsale-vote-user-item", Consumed.with(stringSerde, stringSerde))