ALTER OPERATOR changes the definition of an operator. The only currently available functionality is to change the owner of the operator.
The name (optionally schema-qualified) of an existing operator.
The data type of the operator's left operand; write NONE if the operator has no left operand.
The data type of the operator's right operand; write NONE if the operator has no right operand.
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;