aliehsaeedii commented on code in PR #22156:
URL: https://github.com/apache/kafka/pull/22156#discussion_r3595845692


##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/OuterStreamJoinStoreFactory.java:
##########
@@ -96,7 +94,9 @@ public StoreBuilder<?> builder() {
         final TimestampedKeyAndJoinSideSerde<K> timestampedKeyAndJoinSideSerde 
= new TimestampedKeyAndJoinSideSerde<>(streamJoined.keySerde());
         final LeftOrRightValueSerde<V1, V2> leftOrRightValueSerde = new 
LeftOrRightValueSerde<>(streamJoined.valueSerde(), 
streamJoined.otherValueSerde());
 
-        // Once the headers-aware version of ListValueStore is implemented 
(planned for AK 4.4), replace the PLAIN constant with the dslStoreFormat() 
method.
+        // We always use the PLAIN underlying bytes-store supplier: the 
per-element headers
+        // (when in HEADERS mode) are embedded inside each list element's 
value bytes, so
+        // the bytes-store layer itself needs no special header support.

Review Comment:
   oh, big headache! then I have to re-design everything:(



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