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${ noResults }
Joan Goyeau
ad56f04af9
In #4919 we propagate the SerDes for each of these aggregation operators. As @guozhangwang mentioned in that PR: ``` reduce: inherit the key and value serdes from the parent XXImpl class. count: inherit the key serdes, enforce setting the Serdes.Long() for value serdes. aggregate: inherit the key serdes, do not set for value serdes internally. ``` Although it's all good for reduce and count, it is quiet unsafe to have aggregate without Materialized given. In fact I don't see why we would not give a Materialized for the aggregate since the result type will always be different (otherwise use reduce) and also the value Serde is simply not propagated. This has been discussed previously in a broader PR before but I believe for aggregate we could pass implicitly a Materialized the same way we pass a Joined, just to avoid the stupid case. Then if the user wants to specialize, he can give his own Materialized. Reviewers: Debasish Ghosh <dghosh@acm.org>, Guozhang Wang <guozhang@confluent.io> |
7 years ago | |
|---|---|---|
| .. | ||
| src | KAFKA-6936: Implicit materialized for aggregate, count and reduce (#5066) | 7 years ago |
| .gitignore | KAFKA-6670: Implement a Scala wrapper library for Kafka Streams | 7 years ago |
| NOTICE | KAFKA-6670: Implement a Scala wrapper library for Kafka Streams | 7 years ago |