_HierarchyLevelNames
The _HierarchyLevelNames table stores the levels in the hierarchies that
      the combined table columns represent.
    This table describes _HierarchyLevelNames:
| Column | Type | Description | 
|---|---|---|
| DimensionName | String(50) | Name of dimension. | 
| HierarchyName | String(50) | Name of hierarchy. | 
| LevelNumber | Integer | Number of the level. | 
| LevelName | String(50) | Name of the level. | 
| ColumnName | String(50) | When the related hierarchy has a HierarchyType = 0, this is the
              name of the relational source column. ColumnName can be NULL for a Hierarchy with the same name as the dimension. ColumnName must be NULL for the top level in a star schema Hierarchy (‘combined table’)  | 
          
| Comment | Text | User defined comment. |