ALTER OPERATOR CLASS SQL - Language Statements ALTER OPERATOR CLASS change the definition of an operator class ALTER OPERATOR CLASS ALTER OPERATOR CLASS name USING index_method RENAME TO newname ALTER OPERATOR CLASS changes the definition of an operator class. The only functionality is to rename the operator class. name The name (optionally schema-qualified) of an existing operator class. index_method The name of the index method this operator class is for. newname The new name of the operator class. There is no ALTER OPERATOR CLASS statement in the SQL standard.