just in case, thses are the working ones
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE user = :1 AND mail = 
:2', user_ref.key(), mail_ref.key() )*
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE user = :1', user_ref )*
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE user = :1', 
user_ref.key() )*
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE mail = :1', mail_ref )*
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE mail = :1', 
mail_ref.key() )*

and these are the one that fails during fetch / get / count
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE user != :1 AND mail = 
:2', user_ref.key(), mail_ref.key() )*
*query = db.GqlQuery( 'SELECT * FROM userMail WHERE user != :1 AND mail = 
:2', user_ref, mail_ref )*

there might be a bug I'm afraid. does anyone know how to contact Google?

best, Hiro

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