[datatable-help] Error that I don't think should be an error

[Chris Neff]

> In this case, it should be a warning not error, I'm thinking.

I think that is a fine middle ground.  It would still make me code
extra for it because warnings are almost as annoying as errors, but
that seems like the right balance, saying "hey you sure about that?"
while still not terminating the running code.


>>  and I don't know
>> if it is a compelling enough reason to deviate.
>>
>>>
>>>> Pretty simple. I think assigning NULL to a column that doesn't exist
>>>> should just work as a no-op instead of failing with an error. No-op is
>>>> consistent with data.frame:
>>>>
>>>>> dt=data.table(x=1:10)
>>>>> dt$y=NULL
>>>> Error in `[<-.data.table`(x, j = name, value = value) :
>>>>   RHS is NULL, meaning delete column(s). But, at least one column is
>>>> not present.
>>>>> dt[,y:=NULL]
>>>> Error in `[.data.table`(dt, , `:=`(y, NULL)) :
>>>>   RHS is NULL, meaning delete column(s). But, at least one column is
>>>> not present.
>>>>> df=data.frame(x=1:10)
>>>>> df$y=NULL
>>>>
>>>> If agreed I will file a bug report.
>>>>
>>>> -Chris
>>>> _______________________________________________
>>>> datatable-help mailing list
>>>> datatable-help at lists.r-forge.r-project.org
>>>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
>>>>
>>>
>>>
>>>
>>
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