The catalog pg_opfamily defines operator families. Each operator family is a collection of operators and associated support routines that implement the semantics specified for a particular index access method. Furthermore, the operators in a family are all "compatible", in a way that is specified by the access method. The operator family concept allows cross-data-type operators to be used with indexes and to be reasoned about using knowledge of access method semantics.
Operator families are described at length in Section 34.14.
Table 44-27. pg_opfamily Columns
|opfmethod||oid||pg_am.oid||Index access method operator family is for|
|opfname||name||Name of this operator family|
|opfnamespace||oid||pg_namespace.oid||Namespace of this operator family|
|opfowner||oid||pg_authid.oid||Owner of the operator family|