Daren Thomas created KAFKA-7577:
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Summary: Semantics of Table-Table Join with Null Message Are
Incorrect
Key: KAFKA-7577
URL: https://issues.apache.org/jira/browse/KAFKA-7577
Project: Kafka
Issue Type: Bug
Affects Versions: 1.1.0
Reporter: Daren Thomas
Observed behavior of Table-Table join with a Null Message does not match the
semantics described in the documentation
([https://docs.confluent.io/current/streams/developer-guide/dsl-api.html#ktable-ktable-join).]
The expectation is:
* Message A results in [A, null] from the Left Join
* Message null (tombstone) results in null (tombstone) from the Left Join
The observed behavior was that the null (tombstone) message did not pass
through the Left Join to the output topic like expected. This behavior was
observed with and without caching enabled, against a test harness, and against
a local Confluent 5.0.0 platform. It was also observed that the
KTableKTableLeftJoinProcessor.process() function was not called for the null
(tombstone) message.
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