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51.35. 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 “[.quote]#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 37.14.

Table 51.35. pg_opfamily Columns

Name Type References Description

oid

oid

Row identifier (hidden attribute; must be explicitly selected)

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

+

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.


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51.34. pg_operator

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