Igor Fomenko created KAFKA-15299:
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Summary: 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
Assignee: Igor Fomenko
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 each output message is produced for each
event on the input stream.
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