 
| Name | Description | Type | Package | Framework | 
| PartiallyOrderedSet | Partially-ordered set. | Class | org.apache.calcite.util | Calcite | 
| PartiallyOrderedSet .Ordering | To obey the constraints of the partially-ordered set, the function must be consistent with the reflexive, anti-symmetric, and transitive | Interface | org.apache.calcite.util.PartiallyOrderedSet | Calcite |