Specifying Essential Fields
When mapping to an existing stream, essential fields will typically be specified by the stream author. These essential fields indicate whether a particular field is used in downstream operations. For example, the existing stream may build a model that uses a field called Churn. In this stream, Churn is an essential field because you could not build the model without it. Likewise, fields used in manipulation nodes, such as a Derive node, are necessary to derive the new field. Explicitly setting such fields as essential helps to ensure that the proper fields in the new source node are mapped to them. If mandatory fields are not mapped, you will receive an error message. If you decide that certain manipulations or output nodes are unnecessary, you can delete the nodes from the stream and remove the appropriate fields from the Essential Fields list.
To Set Essential Fields
- Right-click the source node of the template stream that will be replaced.
- On the menu, click:
- Using the Field Chooser, you can add or remove fields from the list. To open the Field Chooser, click the icon to the right of the fields list.