Transformations > Expression transformation > Expression fields
  

Expression fields

An expression field defines the calculations to perform on an incoming field and acts as the output field for the results. You can use as many expression fields as necessary to perform calculations on incoming fields.
When you configure an expression field, you define the field name, data type, precision, scale, and optional description. The description can contain up to 4000 characters. You also define the calculations that you want to perform.