python - 使用 vaex 连接两个数据框

Question

我正在尝试加入两个全部由 vaex 导入的数据框。我认为这应该很简单，但我对vaex expressions. 这是我所做的：

vx_neighbors.join(vx_neighbours_df, on=['Neighbour', 'Year', 'day'])

我得到了错误：

c:\python-3.8.2\lib\site-packages\vaex\join.py in join(df, other, on, left_on, right_on, lprefix, rprefix, lsuffix, rsuffix, how, allow_duplication, prime_growth, cardinality_other, inplace)
    145     left = left if inplace else left.copy()
    146 
--> 147     on = _ensure_string_from_expression(on)
    148     left_on = _ensure_string_from_expression(left_on)
    149     right_on = _ensure_string_from_expression(right_on)

c:\python-3.8.2\lib\site-packages\vaex\utils.py in _ensure_string_from_expression(expression)
    770         return expression.expression
    771     else:
--> 772         raise ValueError('%r is not of string or Expression type, but %r' % (expression, type(expression)))
    773 
    774 

ValueError: ['Neighbour', 'Year', 'day'] is not of string or Expression type, but <class 'list'>

如何将列表转换为 vaex 表达式？