To implement these methods in a generic way, the operator class

defines its own internal support functions.

(For instance, <quote>min/max</> operator classesimplements

support functions for the four inequality operators forthe data type.)

(For instance,the<quote>min/max</> operator classesimplement

support functions for the four inequality operators fortheir data type.)

Additionally, the operator class must supply appropriate

operator entries,

to enable the optimizer to use the index when those operators are