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The Union transformation takes a set of inputs and creates a vector of strings as the output.
If one of the inputs is itself a vector, each element in the input vector is associated with one element in the output vector (that is, the transformation does not create a vector of vectors).
|Name||Descriptive name of the transformation. You can enter any name here.|
|Comments||Optional. Notes about the transformation.|
|Condition||The conditions under which this transformation is applied.|
|Default||The default value to use if the condition is met and the input value is not available.|
|Inputs||One or more input values.|
|Output||The name of the output field.|
This example uses fields of data from website traffic to create a list of the zip codes associated with the website’s visitors (that is, within each log entry). The data provides two possible sources for this information: one in cs-uri-query and the other in a zipcode field of the cookie. If neither of these fields contains a zip code, the default value of 00000 is used.
While it is possible for both of these values to be available in a single log entry, you can select which value to use when you create a dimension based on the transformation’s output. In a typical use case, you would create a simple dimension that takes either the first or the last of the encountered values. For information about creating simple dimensions, see Extended Dimensions.