[datatable-help] CJ and setkey sort differently

[Arunkumar Srinivasan]

Malcolm,

Thanks for the nice report. I suppose your `dt` creation should be: `dt <- CJ(vec1, vec2)`. The reason is pretty clear. It's an easy fix. Could you please file a bug report? Thank you.

Arun
From: Malcolm Hawkes Malcolm Hawkes
Reply: Malcolm Hawkes mhawkes at gcmlp.com
Date: February 14, 2014 at 10:34:21 PM
To: datatable-help at lists.r-forge.r-project.org datatable-help at lists.r-forge.r-project.org
Subject:  [datatable-help] CJ and setkey sort differently  
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
 
 
 
---

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