title: using User ID feature, export to bigquery
body: <p>I have a question when using the User ID feature to track users across devices/browsers.</p>
  
  <p>If I activate the transfer service from GA to Bigquery in which field will I get that information. Would it use the same fullVisitorId column or a new one will be created?</p>
  
  <p>thanks,
  mike</p>