vvcephei commented on code in PR #12535:
URL: https://github.com/apache/kafka/pull/12535#discussion_r949454836


##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/CombinedKey.java:
##########
@@ -38,8 +38,22 @@ public KP getPrimaryKey() {
         return primaryKey;
     }
 
-    public boolean equals(final KF foreignKey, final KP primaryKey) {
-        return this.foreignKey.equals(foreignKey) && 
this.primaryKey.equals(primaryKey);
+    @Override
+    public int hashCode() {
+        return Objects.hash(foreignKey, primaryKey);
+    }

Review Comment:
   Sounds good to me.



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