Yasuhiro Matsuda created KAFKA-2984:
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Summary: KTable should send old values to downstreams
Key: KAFKA-2984
URL: https://issues.apache.org/jira/browse/KAFKA-2984
Project: Kafka
Issue Type: Sub-task
Components: kafka streams
Affects Versions: 0.9.0.1
Reporter: Yasuhiro Matsuda
Assignee: Yasuhiro Matsuda
Old values are necessary for implementing aggregate functions. KTable should
augment an event with its old value. Basically KTable stream is a stream of
(key, (new value, old value)) internally. The old value may be omitted when it
is not used in the topology.
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