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
"
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
|
|
Index access method operator family is for |
opfname
|
name
|
Name of this operator family | |
opfnamespace
|
oid
|
|
Namespace of this operator family |
opfowner
|
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
.