NULL handling determines how the Data Integration Service processes NULL value data in a Decision transformation.
When you enable NULL handling, the Decision transformation retains the original form of NULL input data. The transformation evaluates functions using the NULL input value.
When you disable NULL handling, the Decision transformation assigns a default value to NULL input data. The transformation evaluates functions using the default value. For example, if an integer type input field has a NULL value, the Decision transformation assigns a value of 0 to the input and evaluates functions using an input value of 0.
By default, NULL handling is not enabled in the Decision transformation. You enable NULL handling on the
Strategies
tab. You can enable NULL handling after you configure a strategy for the transformation.