Updated on 2023-10-23 GMT+08:00

PG_OPFAMILY

PG_OPFAMILY defines operator families.

Each operator family is a collection of operators and associated support routines that implement 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 allows cross-data-type operators to be used with indexes and to be reasoned about using knowledge of access method semantics.

Table 1 PG_OPFAMILY columns

Name

Type

Reference

Description

oid

oid

-

Row identifier (hidden attribute, which must be specified)

opfmethod

oid

PG_AM.oid

Index access method used by an operator family

opfname

name

-

Name of the operator family

opfnamespace

oid

PG_NAMESPACE.oid

Namespace of the operator family

opfowner

oid

PG_AUTHID.oid

Owner of the operator family

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.