remove unused stuff that prevents doc building

src/glc_code.erl

@@ -305,18 +305,6 @@ field_variable_([]) ->
 param_variable(Key) ->
     ?erl:variable("Param_" ++ integer_to_list(Key)).
 
-%% @private Generate a list of field variable names.
-%% Walk the query tree and generate a safe variable name string for each field
-%% that is accessed by the conditions in the query. Only allow alpha-numeric.
-%%-spec field_variables(glc_ops:op()) -> [{atom(), string()}].
-%%field_variables(Query) ->
-%%    lists:usort(field_variables_(Query)).
-
-%%-spec field_variables(glc_ops:op()) -> [{atom(), string()}].
-%%field_variables_({Key, '=', _Term}) ->
-%%    [{Key, field_variable(Key)}].
-
-
 
 %% @private Return an expression to increment a counter.
 %% @todo Pass state record. Only Generate code if `statistics' is enabled.