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 38.15.
Table 52.35. 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.