instance method cast_result

# File activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb, line 179
          def cast_result(result)
            ar_result = if result.fields.empty?
              ActiveRecord::Result.empty(affected_rows: result.cmd_tuples)
            else
              fields = result.fields
              types = Array.new(fields.size)
              fields.size.times do |index|
                ftype = result.ftype(index)
                fmod  = result.fmod(index)
                types[index] = get_oid_type(ftype, fmod, fields[index])
              end

              ActiveRecord::Result.new(fields, result.values, types.freeze, affected_rows: result.cmd_tuples)
            end

            result.clear
            ar_result
          end