When using SQLAlchemy SQL Expressions, what's the appropriate syntax
for doing a left join on a sub-query so that you can select results
from the sub-query and include them in the results for the main query
e.g.:

SELECT organization.name,  email_address.email,
FROM organization
   LEFT JOIN (
     SELECT DISTINCT email.address AS email, organization.id AS org_id
     FROM email, organization, organization_email
     WHERE organization.id = organization_email.organization_id AND
       email.id = organization_email.email_id
     LIMIT 1
) email_address ON email_address.org_id = organization.id

-lcr

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