bbejeck commented on code in PR #19404:
URL: https://github.com/apache/kafka/pull/19404#discussion_r2072456537


##########
streams/src/main/java/org/apache/kafka/streams/state/internals/SessionKeySchema.java:
##########
@@ -196,4 +196,15 @@ public static void writeBinary(final ByteBuffer buf,
         buf.putLong(endTime);
         buf.putLong(startTime);
     }
+
+    static Bytes toStoreKeyBinary(final byte[] serializedKey,
+                                  final long endTime,
+                                  final long startTime) {
+        final ByteBuffer buf = ByteBuffer.allocate(serializedKey.length + 
TIMESTAMP_SIZE + TIMESTAMP_SIZE);
+        buf.put(serializedKey);
+        buf.putLong(endTime);
+        buf.putLong(startTime);
+
+        return Bytes.wrap(buf.array());
+    }

Review Comment:
   Since this is only used in the test maybe move it to 
`SegmentedCacheFunctionTest`



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