pg_opfamily

pg_opfamily

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.

The majority of the information defining an operator family is not in its pg_opfamily row, but in the associated rows in pg_amop, pg_amproc, and pg_opclass.

Table 1. pg_opfamily
Name Type References Description
oid oid   Row identifier (hidden attribute; must be explicitly selected)
opfmethod oid pg_am.oid Index access method operator for this family
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