[BUG-REPORT] SyntaxError when representing result of a basic operation involving Expression and numpy array, with the array on the right of the operator about vaex

[athob]

To add on this, the following line:

np.random.rand(n_rows) * ds.a0

actually produces a numpy array made of n_rows Expression objects, with each i-th Expression corresponding to the i-th element of the random array multiplied by the ds.a0 Expression object. This doesn't feel very intuitive to me, but I may be mistaken about what to expect from this line of code.