def comparator(name, first, second): ...
def current_node(): ...
def expref(expression): ...
def function_expression(name, args): ...
def field(name): ...
def filter_projection(left, right, comparator): ...
def flatten(node): ...
def identity(): ...
def index(index): ...
def index_expression(children): ...
def key_val_pair(key_name, node): ...
def literal(literal_value): ...
def multi_select_dict(nodes): ...
def multi_select_list(nodes): ...
def or_expression(left, right): ...
def and_expression(left, right): ...
def not_expression(expr): ...
def pipe(left, right): ...
def projection(left, right): ...
def subexpression(children): ...
def slice(start, end, step): ...
def value_projection(left, right): ...