Values.SelectorSourceA comparision that is used to determine whether a query should return this object.
type nonrec t = {fieldName : String_.t option;The name of the field that the operator will be applied to. The field name is the "key" portion of the field definition in the pipeline definition syntax that is used by the AWS Data Pipeline API. If the field is not set on the object, the condition fails.
*)operator : Operator.t option;}