spark-doris-connector 25.0.1 format= csv时 String类型数据空值 写入doris 转换错误

spark-doris-connector 25.0.1
spark 3.5.5
doris 2.1.8
配置
"sink.properties.format" = "csv",
"sink.properties.column_separator" = "\x01"
format 为csv， String类型为空时，写入到DORIS 为字符串 "null".