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https://issues.apache.org/jira/browse/KAFKA-3545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583149#comment-15583149
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Greg Fodor commented on KAFKA-3545:
-----------------------------------
Yes
> Generalized Serdes for List/Map
> -------------------------------
>
> Key: KAFKA-3545
> URL: https://issues.apache.org/jira/browse/KAFKA-3545
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Greg Fodor
> Priority: Minor
> Labels: api, newbie
> Fix For: 0.10.1.0
>
>
> In working with Kafka Streams I've found it's often the case I want to
> perform a "group by" operation, where I repartition a stream based on a
> foreign key and then do an aggregation of all the values into a single
> collection, so the stream becomes one where each entry has a value that is a
> serialized list of values that belonged to the key. (This seems unrelated to
> the 'group by' operation talked about in KAFKA-3544.) Basically the same
> typical group by operation found in systems like Cascading.
> In order to create these intermediate list values I needed to define custom
> avro schemas that simply wrap the elements of interest into a list. It seems
> desirable that there be some basic facility for constructing simple Serdes of
> Lists/Maps/Sets of other types, potentially using avro's serialization under
> the hood. If this existed in the core library it would also enable the
> addition of higher level operations on streams that can use these Serdes to
> perform simple operations like the "group by" example I mention.
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