private Object ponderGlobalPostHook(Object result) {
      Hook globalHook = this.globalHook;
      return (globalHook != null) ? globalHook.postRead(result) : result;
    }
Provides general-purpose hooks for specific types, as well as a global hook.
ql/src/java/org/apache/hadoop/hive/ql/exec/SerializationUtilities.java