Field History tracking objects, such as "AccountHistory", "ContactHistory", etc., keep track of changes to field values on records of objects with History tracking enabled on those fields. The original and updated values are stored in the "OldValue" and "NewValue" fields, respectively, both of which have a Schema.DisplayType
of ANYTYPE
(see the list of possible Schema.DisplayType Enum values).
My question is, are Field History tracking objects the ONLY place in Salesforce that you'll encounter fields of DisplayType "ANYTYPE", or are there other places as well?
Task.Subject
that's a freetext but you can select from "picklist".