[datatable-help] CJ and setkey sort differently

[Malcolm Hawkes]

Ran in to the warning

Warning in setkeyv(x, cols, verbose = verbose) :
  Already keyed by this key but had invalid row order, key rebuilt. If you didn't go under the hood please let datatable-help know so the root cause can be fixed.

You can reproduce it with
vec1 <- c("CMDTY", "Copper", "CORPOAS")
vec2 <-  1:3
dt <- CJ(vec1, Date)
setkey(dt, V1, V2)

Issue seems to be that CJ (..., sorted = TRUE) and setkey want to sort the character data in different orders, one case-sensitive, one not.

CJ creates

     V1 V2
1: Corp  1
2: Corp  2
3: Corp  3
4: CORP  1
5: CORP  2
6: CORP  3

And it's keyed as you would expect by V1 then V2
> key(dt)
[1] "V1" "V2"


But after doing setkey you have

     V1 V2
1: CORP  1
2: CORP  2
3: CORP  3
4: Corp  1
5: Corp  2
6: Corp  3



data.table version 1.8.10

> R.version
               _
platform       x86_64-w64-mingw32
arch           x86_64
os             mingw32
system         x86_64, mingw32
status
major          3
minor          0.2
year           2013
month          09
day            25
svn rev        63987
language       R
version.string R version 3.0.2 (2013-09-25)
nickname       Frisbee Sailing
>


Malcolm Hawkes
On-Site Consultant, Investments - RiskManagement
Grosvenor Capital Management, L.P.
900 N. Michigan Avenue, Suite 1100
Chicago, IL  60611
mhawkes at gcmlp.com



---

Disclosure and Statement of Confidentiality

Grosvenor Securities LLC, Member FINRA, Serves as Placement Agent or Distributor for Certain Investment Products Managed/Advised by GCM Grosvenor-Affiliated Entities.

The contents of this e-mail message and its attachments (if any) may be proprietary and/or confidential and are intended solely for the addressee(s) hereof. In addition, this e-mail message and its attachments (if any) may be subject to non-disclosure or confidentiality agreements or applicable legal privileges, including privileges protecting communications between attorneys or solicitors and their clients or the work product of attorneys and solicitors. If you are not the named addressee, or if this e-mail message has been addressed to you in error, please do not read, disclose, reproduce, distribute, disseminate or otherwise use this message or any of its attachments. Delivery of this e-mail message to any person other than the intended recipient(s) is not intended in any way to waive privilege or confidentiality. If you have received this e-mail message in error, please alert the sender by reply e-mail; we also request that you immediately delete this e-mail message and its attachments (if any). Grosvenor Capital Management, L.P., GCM Customized Fund Investment Group, L.P. and their affiliated entities (collectively, "GCM Grosvenor") reserve the right to monitor all e-mail communications through their networks. GCM Grosvenor gives no assurances that this e-mail message and its attachments (if any) are free of viruses and other harmful code.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.r-forge.r-project.org/pipermail/datatable-help/attachments/20140214/5863f28d/attachment.html>