CREATE OPERATOR FAMILY
creates a new operator family. An operator family defines a collection of related operator classes, and perhaps some additional operators and support functions that are compatible with these operator classes but not essential for the functioning of any individual index. (Operators and functions that are essential to indexes should be grouped within the relevant operator class, rather than being
in the operator family. Typically, single-data-type operators are bound to operator classes, while cross-data-type operators can be loose in an operator family containing operator classes for both data types.)
The new operator family is initially empty. It should be populated by issuing subsequent
CREATE OPERATOR CLASS
commands to add contained operator classes, and optionally
ALTER OPERATOR FAMILY
commands to add
operators and their corresponding support functions.
If a schema name is given then the operator family is created in the specified schema. Otherwise it is created in the current schema. Two operator families in the same schema can have the same name only if they are for different index methods.
The user who defines an operator family becomes its owner. Presently, the creating user must be a superuser. (This restriction is made because an erroneous operator family definition could confuse or even crash the server.)
Section 35.14, Interfacing Extensions To Indexes, in the documentation
for further information.