In BigQuery, to implement column level access control, we make the use of policy tags. I have created a taxonomy under which I have created a policy tag, let's say P1.
I can apply this tag onto any column in a table of my choice to restrict access to that specific column. After that only the users I associate with the policy tag P1, will be able to access that column.
I know how to see the view/manage the list of users through the console, when I go to policy tags section and click on the specific tag.
Through the client.get_table method I am even able to get what policy is applied to what column on a table when I list the schema. But I am unable to fetch the list of users associated with that policy.
Note: This policy is different from an IAM policy which gives users access to a project/dataset/table or even a row based access policy.
