同步oracle数据到hive的问题

当oracle读取的数据有null值时，对应写到的hive的值会向前一列移位，也就是说orcle对应的null没有写到hive上去，把null漏掉了，这个问题怎么解决的，请问？

The report concerns DataX synchronization from Oracle to Hive and a null-value column shift. Start by reproducing the transfer with a nullable Oracle field and inspect the relevant reader and writer path; done means the Hive output preserves the null in its original column. No file, test, or entry point is named, so locating the affected connector is part of the work.

Written by the indexing model from the issue text.