Parameterizing the Workflow

Let's consider a simple workflow: read the Demographics.csv file, filter all data rows with Gender = M or F, and replace M or F with Male or Female, respectively. Once we have decided whether to work on M or F, the workflow becomes quite simple and includes a File Reader, Row Filter, and String Manipulation node with the replace() function:

1. Let's add one node that allows us to choose whether to work on M or F records: the String Configuration node. This node generates a flow variable. A flow variable is a parameter that travels with the data flow along the workflow branch and it can be used to overwrite settings in other nodes.
2. As far as we are concerned, for now, two settings are important in the configuration window of this node: the default value and the variable name. Let's use default value M for now, to work with Gender = M records, and let's name the flow variable gender_variable.
3. Executing the node creates a Flow...