Hive Table has no partition field

[win-shy]

When I add a Hive Service pull the schemas of hive table. But The table Schema has no partition field of hive. for example:

CREATE EXTERNAL TABLE `dw.XXX`(
  `id` string
PARTITIONED BY ( `year` int, `month` int, `day` int)

The fields of year 、month and day are all not being displayed on the Schema Page.

I wonder if this is a bug or is it just designed so. Thanks