# File lib/dbd/pg/tuples.rb, line 23
    def column_info
        a = []
        0.upto(@pg_result.num_fields-1) do |i|
            str = @pg_result.fname(i)

            typeinfo = nil

            begin
                typmod = @pg_result.fmod(i)
            rescue
            end

            if typmod and typ = @pg_result.ftype(i)
                res = @db._exec("select format_type(#{typ}, #{typmod})")
                typeinfo = DBI::DBD::Pg.parse_type(res[0].values[0])
            end

            map = @db.type_map[@pg_result.ftype(i)] || { }
            h = { "name" => str }.merge(map)

            if typeinfo
                h["precision"]     = typeinfo[:size]
                h["scale"]         = typeinfo[:decimal]
                h["type"]          = typeinfo[:type]
                h["array_of_type"] = typeinfo[:array]

                if typeinfo[:array]
                    h['dbi_type'] = 
                        DBI::DBD::Pg::Type::Array.new(
                            DBI::TypeUtil.type_name_to_module(typeinfo[:type])
                    )
                end
            end

            a.push h
        end

        return a
    end