sink.properties.columns config issue

[ChenShuai1981]

flink doris connector 什么情况需要用到 'sink.properties.columns' 配置参数？在flink sql中不是有定义sink doris的table列么，为什么还需要再在这个参数中申明需要插入哪些字段呢？即使是在部分列更新场景也可以从flink sql table中获取字段名呀，例如：
CREATE TABLE flink_doris_sink (
name STRING,
age INT,
price DECIMAL(5,2),
sale DOUBLE
)
WITH (
'connector' = 'doris',
'fenodes' = 'FE_IP:HTTP_PORT',
'table.identifier' = 'db.table',
'username' = 'root',
'password' = 'password',
'sink.label-prefix' = 'doris_label'，
'sink.properties.partial_columns' = 'true',
‘sink.properties.columns’=‘name,age,price,sale’
);