I am in the midst of a controlled test verifying the link between Google Analytics & BigQuery data. In theory the BigQuery fullVisitorId is supposed to be equivalent to the client ID. That said, the following controlled test was just completed:
- I visited an internal website with a custom source/medium of "nate/nate" obtained the GA client ID from the cookie (values was 1535662810)
- I expected that the client ID would map to the fullVisitorId in BQ
- Unfortunately, when I query the BigQuery data set using the following query the fullVisitorId is 6595621548070533271.
Can anyone comment on the difference that is being observed?
SELECT fullVisitorId
FROM [98843070.ga_sessions_intraday_20150716]
WHERE trafficSource.medium = 'nate'