m1a2st commented on code in PR #20334:
URL: https://github.com/apache/kafka/pull/20334#discussion_r2288168060


##########
connect/transforms/src/main/java/org/apache/kafka/connect/transforms/HeaderFrom.java:
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@@ -61,11 +61,13 @@ public abstract class HeaderFrom<R extends 
ConnectRecord<R>> implements Transfor
 
     public static final ConfigDef CONFIG_DEF = new ConfigDef()
             .define(FIELDS_FIELD, ConfigDef.Type.LIST,
-                    NO_DEFAULT_VALUE, new NonEmptyListValidator(),
+                    NO_DEFAULT_VALUE,
+                    new NonEmptyListValidator(),

Review Comment:
   This configuration should allow duplicate values. Therefore, its default 
value should be set to `NO_DEFAULT_VALUE`, and its validator should be 
`NonEmptyListValidator()`. See the [test 
case](https://github.com/apache/kafka/blob/18045c6ac30921503deffbef1744bb365dc599fb/connect/transforms/src/test/java/org/apache/kafka/connect/transforms/HeaderFromTest.java#L240).



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