What happens if the fields defined in the results tab of a KPI are not summarized?

When fields defined in the results tab of a KPI are not summarized, the system processes this by returning the count of matched records. This allows users to gain insights into the quantity of records that meet the criteria set in the KPI without attempting to aggregate data that wasn't specified for summarization. This functionality helps in monitoring performance metrics and key indicators even when detailed summation is not provided for each individual field. Thus, the KPI effectively represents the scope of data being assessed, ensuring that users can still understand trends or patterns in their data by knowing how many records are relevant to the KPI's criteria.

The other options do not accurately describe what happens when fields are not summarized. For example, returning no data would imply a failure in execution, which isn't the case here. Displaying only the names of the fields would not provide any useful information for analysis. Lastly, while errors in the KPI display could stem from other issues, they are not a standard outcome in the absence of summarization.