PostgreSQL 8.0.1 Documentation
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ALTER OPERATOR

Name

ALTER OPERATOR -- change the definition of an operator

ALTER OPERATOR name ( { lefttype | NONE } , { righttype | NONE } ) OWNER TO newowner

ALTER OPERATOR changes the definition of an operator. The only currently available functionality is to change the owner of the operator.

name: The name (optionally schema-qualified) of an existing operator.
lefttype: The data type of the operator's left operand; write NONE if the operator has no left operand.
righttype: The data type of the operator's right operand; write NONE if the operator has no right operand.
newowner: The new owner of the operator. You must be a superuser to change the owner of an operator.

Change the owner of a custom operator a @@ b for type text:

ALTER OPERATOR @@ (text, text) OWNER TO joe;

There is no ALTER OPERATOR statement in the SQL standard.