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https://issues.apache.org/jira/browse/KAFKA-9706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17071316#comment-17071316
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Konstantine Karantasis commented on KAFKA-9706:
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Merged to {{trunk}} and release branches {{2.5, 2.4, 2.3, 2.2 and 2.1}}
> Flatten transformation fails when encountering tombstone event
> --------------------------------------------------------------
>
> Key: KAFKA-9706
> URL: https://issues.apache.org/jira/browse/KAFKA-9706
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 2.0.1, 2.1.1, 2.2.2, 2.3.1, 2.4.1
> Reporter: Greg Harris
> Assignee: Greg Harris
> Priority: Major
> Fix For: 2.1.2, 2.2.3, 2.5.0, 2.3.2, 2.4.2
>
>
> When applying the {{Flatten}} transformation to a tombstone event, an
> exception is raised:
> {code:java}
> org.apache.kafka.connect.errors.DataException: Only Map objects supported in
> absence of schema for [flattening], found: null
> {code}
> Instead, the transform should pass the tombstone through the transform
> without throwing an exception.
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