[datatable-help] fread: support int64 package as well, or an option to make 64-bit integers characters

[Chris Neff]

On Thu, May 16, 2013 at 5:00 PM, Matthew Dowle <mdowle at mdowle.plus.com>wrote:

> **
>
>
>
> Hi Chris,
>
> There's the new colClasses argument so you can override particular fields.
>  But see the new ?fread manual page where I've added an integer64 argument,
> documented but not yet implemented, default "integer64" but can be set to
> "numeric" (as read.csv) or "character"  -- think that's exactly what you're
> describing.  I guess you would set the global option datatable.integer64 to
> "character".
>

That sounds exactly like what I want.


> I don't see how we can support int64 because it's implemented as two
> integer vectors, iiuc.  data.table internals need each column to be a
> single vector.
>
Understood.


> Matthew
>
>
>
> On 16.05.2013 08:46, Chris Neff wrote:
>
> Hi all,
> For reasons I won't go into here, I do not use the bit64 package, instead
> opting to use int64.  When I load something that is a long numeric ID (i.e.
> something I actually want as a character not an integer), fread loads this
> as a 64-bit integer using the bit64 encoding.  This makes it impossible to
> convert those to characters without having the bit64 package loaded.
> Would it be possible to either support int64 as well, or if not an option
> to convert it to character when it would decide that 64-bit ints are
> necessary?
> Thanks,
> Chris
>
>
>
>
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