google cloud platform - Trouble Mapping A GA Client ID to a BigQuery fullvisitorID -

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i in midst of controlled test verifying link between google analytics & bigquery data. in theory bigquery fullvisitorid supposed equivalent client id. said, following controlled test completed:

  • i visited internal website custom source/medium of "nate/nate" obtained ga client id cookie (values 1535662810)
  • i expected client id map fullvisitorid in bq
  • unfortunately, when query bigquery data set using following query fullvisitorid 6595621548070533271.

can comment on difference being observed?

select fullvisitorid [98843070.ga_sessions_intraday_20150716] trafficsource.medium = 'nate'


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