`DataFrame select:` fails when no rows are selected

[AtharvaKhare]

Running the following block:

df := DataFrame withRows: #((1) (2) (3) (4)).
df select: [ :row | (row at: 1) >= 5 ].

leads to SubscriptOutOfBounds: 1, due to first in DataFrameInternal withRows::

numberOfColumns := anArrayOfArrays first size.

Shouldn't it return an empty Dataframe instead?

[olekscode]

Yes, that's definitely a bug!
I think, we can fix it by making sure that DataFrame >> withRows: and all related messages return an empty data frame when given an empty array of rows.

DataFrame withRows: #(). "a DataFrame(0@0)"

[AtharvaKhare]

Same is true for reject:

df := DataFrame withRows: #((1) (2) (3) (4)).
df reject: [ :row | (row at: 1) <= 5 ].

[AtharvaKhare]

Can I take this up and adding related tests?

[olekscode]

I have created a related issue #92 for it

[olekscode]

But don't work on this issue now, because I want to plan and organize all tasks and issues first.
We can discuss it tomorrow evening.

[AtharvaKhare]

Fixed with #100.