@org.apache.thrift.annotation.Nullable
    @Override
    public java.lang.Object getFieldValue(_Fields field) {
      switch (field) {
      case EXPRESSION:
        return getExpression();

      case DO_TRUNC:
        return isDoTrunc();

      }
      throw new java.lang.IllegalStateException();
    }
@org.apache.thrift.annotation.Nullable
    @Override
    public java.lang.Object getFieldValue(_Fields field)