Using this query:
SELECT id, username, email
FROM users
The following is returned
All those NULL results are people who have signed up using Google OAuth2
The emails are in the system correctly, I can see them in their profiles.
What am I doing wrong? 
We no longer use the email column on the users table.
You need to join the users table with the user_emails table with the primary = true condition 
SELECT u.id, u.username, u.email, ue.email
FROM users u
INNER JOIN user_emails ue ON u.id = ue.id
WHERE ue.primary = true
That worked
I was thrown off by the one email that was there; but I guess that’s a remnant of running
cd /var/discourse
./launcher enter app
rake admin:create
when I was troubleshooting my email troubles.
The column is in readonly mode. We’ll completely remove it when we’re 100% it’s safe to do so.