vvcephei commented on a change in pull request #10731:
URL: https://github.com/apache/kafka/pull/10731#discussion_r645017943



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KTableTransformValues.java
##########
@@ -158,7 +158,11 @@ public void init(final ProcessorContext context) {
             internalProcessorContext.setRecordContext(new 
ProcessorRecordContext(
                 valueAndTimestamp == null ? UNKNOWN : 
valueAndTimestamp.timestamp(),
                 -1L, // we don't know the original offset
-                currentContext.partition(),
+                // technically, we know the partition, but in the new 
`api.Processor` class,
+                // we move to `RecordMetadata` than would be `null` for this 
case and thus
+                // we won't have the partition information, so it's better to 
now provide it
+                // here either, to not introduce a regression later on
+                -1,

Review comment:
       Good point, @mjsax .




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