mjsax commented on a change in pull request #9186:
URL: https://github.com/apache/kafka/pull/9186#discussion_r485095735
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File path:
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKTableJoinProcessor.java
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@@ -58,22 +58,23 @@ 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,
+ // We allow null keys unless {@code keyMapper} returns {@code null}
and we ignore it as invalid.
Review comment:
I guess we don't care about the original `key` any longer and only
consider if `keyMapper` returns `null` or not?
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