 
| Name | Description | Type | Package | Framework | 
| AbstractConverter | Converts a relational expression to any given output convention. | Class | org.apache.calcite.plan.volcano | Calcite | 
| AbstractConverter .ExpandConversionRule | Rule which converts an AbstractConverter into a chain of converters from the source relation to the target traits. | Class | org.apache.calcite.plan.volcano.AbstractConverter | Calcite |