Doing some research I found the docs... "You cannot project a property that also is referenced in an equality filter. For example SELECT A FROM kind WHERE A = 1 is not supported, but SELECT A FROM kind WHERE B = 1 or SELECT A FROM kind WHERE A > 1 is supported."
So I did ... self.db(self.tabela.nome == nome).select(self.tabela.valor, self.tabela.valor_blob) I cannot (and it is obvioulsy not necessary too) use the field "nome" in query and "select". Now its working fine... Anyone can give any idea about how to test projection x "nomal" queries? I would like to benchmark each situation and post here. Thanks.