In visuals, when you add a field to one of the shelves in Edit
    mode, you can also configure the properties for that field. Aggregate functions calculate a
    return value across all the items in a result set. Cloudera Data Visualization provides
    optional aggregation operations on data values, such as summation, string concatenation, and
    common statistical measurements of data.
    - Click the field you plan to modify, to open the Field
            Properties menu.
 - Under Field Properties, click to expand the
            Aggregates menu.
          
        
 - From the Aggregates menu, select one of the
          options.
The available aggregation functions depend on the connection type and
          data type. A check mark precedes the selected aggregate function.
 - Click Refresh Visual to see the changes.
Fields
          that use an aggregation function have a green dot on the 
Aggregates
            menu.
To remove an aggregate from a field, click the selected aggregate function. It
            removes the check mark.