Igor Fomenko created KAFKA-15299: ------------------------------------ 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. -- This message was sent by Atlassian Jira (v8.20.10#820010)