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 |
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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https://www.postgresql.org/docs/10/catalog-pg-opfamily.html