public java.util.List<GroupDefinition> getGroupBy() {
        return groupBy;
    }
<p>
Groups only by <code>SUBSCRIPTION_ID</code>. Metadata is included.
</p>

@return Groups only by <code>SUBSCRIPTION_ID</code>. Metadata is included.
aws-java-sdk-costexplorer/src/main/java/com/amazonaws/services/costexplorer/model/GetReservationUtilizationRequest.java