NOTE

·           User defined columns can only be added when there is an available data source.

·           The user-defined columns are added in the topmost data source in the Data Sources list or in the joined or combined data source.

·           An auto key can only be created once.

·           Ranking requires a numeric source column.

·           Time bucketing requires a time source column and each source column can only be used once.

·           Numeric bucketing requires a numeric source column.

·           Text grouping requires a text source column.

·           The added user-defined column displays on the Data Preview with a pen symbol  which allows its modification.