Which of the following statements about aggregation functions in an Aggregate is false?

The statement that the output of the Aggregate will contain all attributes from the Source Entities plus the aggregation columns is inaccurate due to the behavior of aggregates in OutSystems. When an Aggregate is created, the primary purpose is to perform data manipulation and compute aggregated values based on specified criteria. In this context, the output typically includes only the results of the specified aggregations and the selected attributes from the entities involved.

In OutSystems, if a column is included in the aggregate results, only those columns that are not marked or grayed out will appear in the final output. This means that any attributes from the source entities that are not specifically designed to output their values (often shown as grayed out in the editor) will not be part of the output data structure. Consequently, the Aggregate output will not include attributes that are grayed out, which emphasizes the selectivity based on the aggregate setup.

Thus, while you may include aggregation functions and certain attributes, the Aggregate does not automatically include all attributes from the source entities; it selectively includes only those that are specified for the output. This understanding of how aggregations work helps developers structure their queries and expected outputs effectively within the OutSystems environment.