presto-parser/src/main/java/io/prestosql/sql/tree/FunctionCall.java/FunctionCall/getChildren
class FunctionCall:    @Override
    public List<Node> getChildren()
    {
        ImmutableList.Builder<Node> nodes = ImmutableList.builder();
        window.ifPresent(nodes::add);
        filter.ifPresent(nodes::add);
        orderBy.map(OrderBy::getSortItems).map(nodes::addAll);
        nodes.addAll(arguments);
        return nodes.build();
    }