如何设置动态分区，其中列键将是分区

So I have a table A and table B, where table A data was inserted from table B. essentially table A is same as table B, only difference is that table A has a date_partition column where table B does not have. the table A schema is as such: ID int school_bg_dt string log_on_count int active_count intSo I have a table A and table B, where table A