StarRocks does not support partition for file external table?

Question

I am trying to create a external table for hdfs files which partitioned with some columns;

But I got an syntax error;

create table web_sales3
(
    ws_sold_date_sk          integer,
    ws_sold_time_sk          integer,
    ws_ship_date_sk          integer,
    ws_item_sk               integer not null,
    ws_bill_customer_sk      integer,
    ws_bill_cdemo_sk         integer,
    ws_bill_hdemo_sk         integer,
    ws_bill_addr_sk          integer,
    ws_ship_customer_sk      integer,
    ws_ship_cdemo_sk         integer,
    ws_ship_hdemo_sk         integer,
    ws_ship_addr_sk          integer,
    ws_web_page_sk           integer,
    ws_web_site_sk           integer,
    ws_ship_mode_sk          integer,
    ws_warehouse_sk          integer,
    ws_promo_sk              integer,
    ws_order_number          integer not null,
    ws_quantity              integer,
    ws_wholesale_cost        decimal(7, 2),
    ws_list_price            decimal(7, 2),
    ws_sales_price           decimal(7, 2),
    ws_ext_discount_amt      decimal(7, 2),
    ws_ext_sales_price       decimal(7, 2),
    ws_ext_wholesale_cost    decimal(7, 2),
    ws_ext_list_price        decimal(7, 2),
    ws_ext_tax               decimal(7, 2),
    ws_coupon_amt            decimal(7, 2),
    ws_ext_ship_cost         decimal(7, 2),
    ws_net_paid              decimal(7, 2),
    ws_net_paid_inc_tax      decimal(7, 2),
    ws_net_paid_inc_ship     decimal(7, 2),
    ws_net_paid_inc_ship_tax decimal(7, 2),
    ws_net_profit            decimal(7, 2)
)engine=FILE
PARTITION BY( ws_sold_date_sk integer)
PROPERTIES 
(
    "path" = "hdfs://7.225.2.179:9000/user/hive/warehouse/perfn_rn.db/web_sales", 
    "format" = "parquet"
);

the error as following; You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(' at line 38