public static ExprNodeGenericFuncDesc deserializeExpression(String s) {
    byte[] bytes = Base64.decodeBase64(s.getBytes(StandardCharsets.UTF_8));
    return deserializeObjectFromKryo(bytes, ExprNodeGenericFuncDesc.class);
  }
Deserializes expression from Kryo.
@param bytes Bytes containing the expression.
@param isPartFilter ture if it is a partition filter
@return Expression; null if deserialization succeeded, but the result type is incorrect.
ql/src/java/org/apache/hadoop/hive/ql/exec/SerializationUtilities.java