doris动态分区的修改有什么注意事项?

ALTER TABLE example_db.my_table set (
"dynamic_partition.enable" = "true", 
"dynamic_partition.time_unit" = "DAY", 
   -- 注意区间start
   "dynamic_partition.start " = "",
   -- 注意区间history
   "dynamic_partition.history_partition_num " = "",
   -- 注意区间end
"dynamic_partition.end" = "3", 
"dynamic_partition.prefix" = "p", 
"dynamic_partition.buckets" = "32"
);