[gnome-db] possible bug on sql parser

the parser removes () from this query and then the query no longer works

select (case when iva > 0 then (iva + 100) / 100) from costi

become

select case when iva > 0 then iva + 100 / 100 from costi

that is equal to

select case when iva > 0 then iva + 1 from costi


i have tried with libgda from git and only with postgresql provider

thanks in advance