private Item buildRange(OperatorNode<ExpressionOperator> spec) {
        assertHasOperator(spec, ExpressionOperator.CALL);
        assertHasFunctionName(spec, RANGE);

        IntItem range = instantiateRangeItem(spec.getArgument(1), spec);
        return leafStyleSettings(spec, range);
    }
Build a "pure" not, without any positive terms.
container-search/src/main/java/com/yahoo/search/yql/YqlParser.java