ALTER OPERATOR — change the definition of an operator
ALTER OPERATORname( {left_type| NONE } ,right_type) OWNER TO {new_owner| CURRENT_ROLE | CURRENT_USER | SESSION_USER } ALTER OPERATORname( {left_type| NONE } ,right_type) SET SCHEMAnew_schemaALTER OPERATORname( {left_type| NONE } ,right_type) SET ( { RESTRICT = {res_proc| NONE } | JOIN = {join_proc| NONE } | COMMUTATOR =com_op| NEGATOR =neg_op| HASHES | MERGES } [, ... ] )
ALTER OPERATOR changes the definition of
an operator.
You must own the operator to use ALTER OPERATOR.
To alter the owner, you must be able to SET ROLE to the
new owning role, and that role must have CREATE
privilege on the operator's schema.
(These restrictions enforce that altering the owner
doesn't do anything you couldn't do by dropping and recreating the operator.
However, a superuser can alter ownership of any operator anyway.)
nameThe name (optionally schema-qualified) of an existing operator.
left_type
The data type of the operator's left operand; write
NONE if the operator has no left operand.
right_typeThe data type of the operator's right operand.
new_ownerThe new owner of the operator.
new_schemaThe new schema for the operator.
res_procThe restriction selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.
join_procThe join selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.
com_opThe commutator of this operator. Can only be changed if the operator does not have an existing commutator.
neg_opThe negator of this operator. Can only be changed if the operator does not have an existing negator.
HASHESIndicates this operator can support a hash join. Can only be enabled and not disabled.
MERGESIndicates this operator can support a merge join. Can only be enabled and not disabled.
Refer to Section 36.14 and Section 36.15 for further information.
Since commutators come in pairs that are commutators of each other,
ALTER OPERATOR SET COMMUTATOR will also set the
commutator of the com_op
to be the target operator. Likewise, ALTER OPERATOR SET
NEGATOR will also set the negator of
the neg_op to be the
target operator. Therefore, you must own the commutator or negator
operator as well as the target operator.
Change the owner of a custom operator a @@ b for type text:
ALTER OPERATOR @@ (text, text) OWNER TO joe;
Change the restriction and join selectivity estimator functions of a
custom operator a && b for
type int[]:
ALTER OPERATOR && (int[], int[]) SET (RESTRICT = _int_contsel, JOIN = _int_contjoinsel);
Mark the && operator as being its own
commutator:
ALTER OPERATOR && (int[], int[]) SET (COMMUTATOR = &&);
There is no ALTER OPERATOR statement in
the SQL standard.