[jira] [Assigned] (KAFKA-15299) Support left stream-table join on foreign key

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-15299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax reassigned KAFKA-15299:
---------------------------------------

    Assignee:     (was: Igor Fomenko)

> Support left stream-table join on foreign key
> ---------------------------------------------
>
>                 Key: KAFKA-15299
>                 URL: https://issues.apache.org/jira/browse/KAFKA-15299
>             Project: Kafka
>          Issue Type: New Feature
>          Components: streams
>            Reporter: Igor Fomenko
>            Priority: Major
>              Labels: kip
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> KIP-955: [https://cwiki.apache.org/confluence/display/KAFKA/KIP-955%3A+Add+stream-table+join+on+foreign+key]
> Currently in Kafka Streams DSL, KStream to KTable joins could only be performed with the keys. However in practice it is often required to join the messages in Kafka topics using message field as a "foreign key" with the following pattern:  
>  
> streamX.leftJoin(tableY, RecordTableY::getForegnKey, joiner).to("output-topic-name")
>  
> The left loin on foreign key operation will result in a stream of messages from two topics joined on foreign key where 0 or more output message is produced for each event on the input stream.



--
This message was sent by Atlassian Jira
(v8.20.10#820010)