如果列被定义为支持空值，那么您必须相应更新空指示符映射。
If the column is defined as null capable, then you must update the null indicator map accordingly.
SIF记录格式还包含特定于delta的列，以协助将现有数据库记录的指示符值设置为NULL。
The SIF record format also contains delta specific columns to assist in setting the indicator values of existing database records to NULL.
对于每个不同的值，该列的指示符变量被设置为0。
The indicator variable for the column is set to zero for each value that is different.
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