@Override
        public Bytes lowerRangeFixedSize(final Bytes key, final long from) {
            final ByteBuffer buffer = ByteBuffer.allocate(PREFIX_SIZE + SessionKeySchema.keyByteLength(key));
            buffer.put(KEY_FIRST_PREFIX);
            SessionKeySchema.writeBinary(buffer, SessionKeySchema.lowerRangeFixedWindow(key, from));
            return Bytes.wrap(buffer.array());
        }
@param key the key in the range
@param from the earliest end timestamp in the range
streams/src/main/java/org/apache/kafka/streams/state/internals/PrefixedSessionKeySchemas.java