fields slot of various S4 objects from
  pullit.R/generics.r, R/methods.r
    get_fields-methods.RdAccess method for the fields slot of various S4 objects from the
  pullit package.
get_fields(object) # S4 method for DataInfo get_fields(object) # S4 method for DataHistorical get_fields(object)
| object | an S4 object of class DataInfo or DataHistorical or childs. | 
|---|
A data.table showing for each Bloomberg ticker, the
  Bloomberg fields for which the object provided contains data.