[datatable-help] Why does cbind drop key?

[Chris Neff]

> But, := is much much better if you can.

Of course, but it is like 12 columns I am adding on programatically,
and i don't want to make a new line for each. Once := supports
multiple arguments I'll use it for this purpose.

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>> When I do cbind(DT, DF), where DT has a key, the result loses the key.
>>  cbind can't change ordering though, so why does that happen?  I can
>> understand if you are trying to combine two keyed DT's that the result
>> is ambiguous, but it isn't in this case.
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