What you could do is create a local user called "testuser". Make sure this user is not part that does not have permission to any space. Then run this SQL query.
FROM SPACEPERMISSIONS sp
JOIN SPACES s ON s.SPACEID = sp.SPACEID
JOIN user_mapping um ON um.user_key = sp.PERMUSERNAME
WHERE um.lower_username = 'testuser'
GROUP BY s.SPACEKEY
ORDER BY s.SPACEKEY;
I am sure there is a better way but.
SQL query is copied and modified from this page.
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