I'm looking at all the ads for a campaign.  I want to fetch the top 
performing ad from the campaign.  By top performing I guess I would choose 
the ad with the highest CTR maybe?  Or maybe the Conversion rate.  Anyways, 
I'm doing this kind of thing:

$user = new AdWordsUser();
$user->setClientCustomerId($accountId);
$user->LoadService('ReportDefinitionService', ADWORDS_VERSION);

$selector = new Selector();
$selector->fields = array(.....);
$selector->predicates[] = new Predicate('CampaignId', 'IN', $campaignIds);

$reportDefinition = new ReportDefinition();
$reportDefinition->selector = $selector;
$reportDefinition->reportName = 'Ad performance report #' . uniqid();
$reportDefinition->dateRangeType = "LAST_30_DAYS";
$reportDefinition->reportType = 'AD_PERFORMANCE_REPORT';
$reportDefinition->downloadFormat = 'XML';
$reportDefinition->includeZeroImpressions = FALSE;

The problem with this API call is that it returns ALL the ads (218 ads for 
this particular campaign I'm testing on).  And I don't think the ads are 
sorted in any logical way that I can see.  Maybe by adID ascending.

Anyways, I tried to add two things to my selector:

$selector->ordering[] = new OrderBy('Ctr', 'DESCENDING');

Gives the error:

*Report download failed. Underlying errors are Type = 
'ReportDefinitionError.SORTING_NOT_SUPPORTED', Trigger = 'Sorting is not 
supported for reports', FieldPath = ''.*


Also, in order to just return the first result only (which work work if I 
could get ordering to work), I tried using paging:

$selector->paging = new Paging(0,1);

But I get 

*Report download failed. Underlying errors are Type = 
'ReportDefinitionError.PAGING_NOT_SUPPORTED', Trigger = 'Paging is not 
supported for reports', FieldPath = ''.*

Okay so downloading reports supports neight ordering or paging/limiting? 
 Am I only able to just fetch ALL the ads and I need to manually sort 
through them myself?  That doesn't seem right...

Am I missing something here?

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