User description of field, undefined if there is none.
Unique string representing this field in this datasource.
True if this field is a table calculation.
True if this field is a combination of multiple fields, false otherwise.
True if this field is generated by Tableau, false otherwise.
Tableau generates a number of fields for a data source, such as Number
of Records, or Measure Values. This property can be used to
distinguish between those fields and fields that come from the underlying
data connection, or were created by a user.