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.