ableegoldman commented on a change in pull request #9186:
URL: https://github.com/apache/kafka/pull/9186#discussion_r485097186



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKTableJoinProcessor.java
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@@ -58,23 +58,22 @@ public void init(final ProcessorContext context) {
 
     @Override
     public void process(final K1 key, final V1 value) {
-        // we do join iff keys are equal, thus, if key is null we cannot join 
and just ignore the record
-        // If {@code keyMapper} returns {@code null} it implies there is no 
match,
-        // so ignore unless it is a left join

Review comment:
       Sorry, I think my original comment here was a bit ambiguous. What I 
meant was that the _removal_ of the comment seemed correct to me, ie we should 
not make any special exceptions for the left join case and should remove the 
`leftJoin` part of the `if (leftJoin || value2 != null) ` check down on line 79




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