51.35. pg_opfamily

51.35. `pg_opfamily`
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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 36.16 .

Table 51.35. pg_opfamily Columns

Column Type Description
`oid` `oid` Row identifier
`opfmethod` `oid` (references `pg_am` . `oid` ) Index access method operator family is for
`opfname` `name` Name of this operator family
`opfnamespace` `oid` (references `pg_namespace` . `oid` ) Namespace of this operator family
`opfowner` `oid` (references `pg_authid` . `oid` ) Owner of the operator family

Column Type

Description

oid oid

Row identifier

opfmethod oid (references pg_am . oid )

Index access method operator family is for

opfname name

Name of this operator family

opfnamespace oid (references pg_namespace . oid )

Namespace of this operator family

opfowner oid (references 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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