While Reveal creates hierarchies for Year-Month-Date date fields automatically, this does not happen for other types of fields.

Hierarchies allow users to analyze the data in charts, gauges, and grid views, allowing users to create new hierarchies with the fields located in the Rows placeholder of the data editor.

How to Enable Hierarchies:

To enable hierarchies, just drag and drop a field in the Add Hierarchy section of the Rows section in the data editor. When you do this, the structure and behavior of the data table will change.