[Dovecot] Dovecot SQL user_query

Hello folkz, Is it possible to setup in dovecot-sql.conf file to run user_query twice if its first run didn't yield any values. And likewise don't proceed with the second run if the first user_query execution produced the result. I have to query two tables which specify there email messages shall be delivered via Dovecot deliver LDA depending on the incoming email addresses.

Please don't question me about this setup. I inherited this mess from the previous Network Admin.

First query should be ran like this: user_query = SELECT concat('maildir:/data/mail/',maildir) as mail FROM folders WHERE email = '%u'

If the first query doesn't yield any result the second shall be ran like this: user_query = SELECT maildir as home FROM users WHERE email = '%u'

Please advise if such user_query setup is possible at all.

Thanks in advance,

Alex