pig/src/main/java/com/twitter/elephantbird/pig/util/PigUtil.java
public static<T extends TBase<?,?>> TypeRef<T> getThriftTypeRef(String thriftClassName) {
    return ThriftUtils.getTypeRef(getClass(thriftClassName));
  }
public static<T extends TBase<?,?>> TypeRef<T> getThriftTypeRef(String thriftClassName) {
    return ThriftUtils.getTypeRef(getClass(thriftClassName));
  }
Returns TypeRef using Pig class loader.