title: Can I receive count of records corresponding to CKQuery from CloudKit?
body: <p>I try to use CKQueryOperation for this:</p>
  
  <pre><code>CKQueryOperation *o = [[CKQueryOperation alloc] initWithQuery:query];
  [o setDesiredKeys:@[]];
  </code></pre>
  
  <p>But it still returns a lot of data that I don't need in this moment</p>
  
  <pre><code>&lt;CKRecord: 0x79881a50; recordType=Comment, recordID=CBB7B269-47AH-406E-8934-682D31501778:(_defaultZone:__defaultOwner__), recordChangeTag=i1x8j1ey, values={
  }&gt;
  {
      creatorUserRecordID -&gt; &lt;CKRecordID: 0x7966e9d0; _e5b178bde573ba6fee336b9ed8:(_defaultZone:__defaultOwner__)&gt;
      lastModifiedUserRecordID -&gt; &lt;CKRecordID: 0x7966cdd0; _e5b178bd3e9e7a6e336b9f34ed8:(_defaultZone:__defaultOwner__)&gt;
      creationDate -&gt; 2014-10-31 07:20:45 +0000
      modificationDate -&gt; 2014-10-31 07:20:45 +0000
      modifiedByDevice -&gt; iPhone Simulator
  }
  </code></pre>
  
  <p>I need only a count of records.</p>