You can access values in the columns of incoming result sets from expressions that you define in an operator.
For example, if you have an Input Source feeding into a Select operator, in the Select’s Where field, you can refer to the Input Source’s columns. To do so, specify the column by name. You can enter column names by hand, or you can use the expressions menu to paste them in for you. The expression you enter in the Where field might be COLOR == "Red" if COLOR is the name of a column in the Input Source’s schema.
If an operator has more than one input feeding into it, qualify the name of the column using the name of the upstream element. For example, if you have an Iterator with inputs from “Aggregate1” and “Aggregate2,” refer to their “Total” columns as Aggregate1.Total and Aggregate2.Total, respectively.
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