Inconsistent column types returned by `sum()`

[Oleksiy]

>>> from datatable import dt
>>> DT = dt.Frame([1, 2])
>>> DT.sum()
   |      C0
   | float64
-- + -------
 0 |       3
[1 row x 1 column]
>>> DT[:, dt.sum(f[0])]
   |    C0
   | int64
-- + -----
 0 |     3
[1 row x 1 column]

Note, that in the first case the returned column type is float64 while in the second case it is int64. It would be nice to return the same column type in the both cases.

[Samuel Oranyeli]

I raised an issue here : #2904

[Oleksiy]

Ah, yes, couldn’t find it. Probably we just need more minimalistic example and the topic should mention sum().

[Oleksiy]

Duplicate of #2904