[KAFKA-9706] Flatten transformation fails when encountering tombstone event

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.1, 2.1.1, 2.2.2, 2.3.1, 2.4.1
• Fix Version/s: 2.1.2, 2.2.3, 2.5.0, 2.3.2, 2.4.2
• Component/s: connect
• Assignee: Greg Harris
• Reporter: Greg Harris
• Created: 11/Mar/20 21:11
• Updated: 30/Mar/20 22:44
• Resolved: 30/Mar/20 22:44

Description

When applying the Flatten transformation to a tombstone event, an exception is raised:

org.apache.kafka.connect.errors.DataException: Only Map objects supported in absence of schema for [flattening], found: null

Instead, the transform should pass the tombstone through the transform without throwing an exception.

Issue Links

• links to: GitHub Pull Request #8279