Hi all,

I am currently trying to fetch all fields listed 
here<https://developers.google.com/adwords/api/docs/reference/v201109/AdGroupAdService.AdStats>in
 AdStats for ad in sandbox. I am using python client library. All fields 
could be retrieved by following selector using ad groupd ad service except 
'startDate' and 'endDate':
selector = {
        'fields': ['Id', 'AdGroupId', 'Impressions', 'startDate', 'endDate',
                    'Clicks', 'Cost', 'Ctr', 'AveragePosition', 
'AverageCpc',
                    'AverageCpm', 'Conversions', 'ViewThroughConversions'],
        'predicates': [
          {
              'field': 'Id',
              'operator': 'EQUALS',
              'values': [ad_id]
          },
        ],
        'paging': {
          'startIndex': str(offset),
          'numberResults': str(self._PAGE_SIZE)
        }
      }

If I add 'StartDate' and 'EndDate', it returns invalid field name error: 
adspygoogle.adwords.AdWordsErrors.AdWordsRequestError: 
[SelectorError.INVALID_FIELD_NAME @ serviceSelector; trigger:'startDate', 
SelectorError.INVALID_FIELD_NAME @ serviceSelector; trigger:'endDate']

Anyone know why it is wrong to fetch these 2 fields directly from ad group 
ad service? 

btw I could get them 2 fields from campaign service; not sure if they are 
the same as that from ad group ad service.

Any help appreciated. Thank you!

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