DuplicateResult Class where are fields added from?

Question

I am using DuplicateResult Class to capture and display duplicate records. I am using this code snippet from the documentation: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_class_Datacloud_DuplicateResult.htm My question is, what indicates what fields from the Contact object are included the matchRecord array? Is it the duplicate rules that define the fields for the query? I am attempting to add additional fields from the Contact object but get an error:

SObject row was retrieved via SOQL without querying the requested field: Account.State

Answer 1

It uses the object's primary CompactLayout. See the findDuplicates() documentation.

If the includeRecordDetails flag in DuplicateRuleHeader is set to false, findDuplicates() only returns the record IDs of the matching records. Otherwise, findDuplicates() returns all the fields specified in the primary CompactLayout associated with the target object

Answer 2

So I think I figured it out.Under the DuplicateResult class there is a method called Datacloud.match. This method identifies the matching or different fields defined in the Matching Rule/Matching criteria. In other words, the only fields returned by the Duplicateresults are fields that are defined in the rules. You can not return a field which is not part of it. I included BillingState in the matching rules, and now I am able to access it.