An iterator of report rows.
Typical usage:
while (reportRowIterator.hasNext()) {
  var reportRow = reportRowIterator.next();
}
Related: 
ReportRow
  Methods:
  
  hasNext()
  Returns 
true if the iterator has more elements.  
Return values:
  
    | Type | Description | 
    
      boolean | 
      true if the iterator has more elements. | 
    
  
  next()
  Returns the next 
ReportRow in the iterator.
Report rows are returned as plain Javascript objects — in other words,
associative arrays. Individual columns can be accessed by indexing by AWQL
column names:
var report = AdsApp.report(
    'SELECT search_term_view.search_term, metrics.ctr ' +
    'FROM   search_term_view ' +
    'WHERE segments.date BETWEEN "2013-01-01" AND "2013-03-01"');
var rows = report.rows();
while (rows.hasNext()) {
  var row = rows.next();
  var query = row['search_term_view.search_term'];
  var ctr = row['metrics.ctr'];
}  Return values:
  
  totalNumEntities()
  Returns the total number of entities matched by the selector which
generated this iterator.
Note that the returned number disregards limits, and that the iterator
is not guaranteed to have this many elements — hasNext will
start to return false and next will start to
throw exceptions as soon as the limit for entity reads has been reached,
even if the selector matched more entities.  
Return values:
  
    | Type | Description | 
    
      int | 
      The number of entities matched by the selector which generated this
    iterator. |