presto-main/src/main/java/io/prestosql/execution/resourcegroups/ResourceUsage.java/ResourceUsage/add
class ResourceUsage:    public ResourceUsage add(ResourceUsage other)
    {
        long newCpuUsageMillis = saturatedAdd(this.cpuUsageMillis, other.cpuUsageMillis);
        long newMemoryUsageBytes = saturatedAdd(this.memoryUsageBytes, other.memoryUsageBytes);
        return new ResourceUsage(newCpuUsageMillis, newMemoryUsageBytes);
    }