Excluding any columns by name from a join causes all columns in `i` to also be excluded

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
r
Domain
data

Research direction

Reproduce the behavior in R using the minimal data.table example and the three join expressions shown. Compare which columns remain for each exclusion case and verify the warning for a missing column. Done means excluding one named column removes only that column while preserving the other join output columns.

Written by the indexing model from the issue text.

Description

consistency scoping

Minimal reproducible example

> df1 = data.table(foo = 1:3, bar = 4:6)
> df2 = data.table(foo = 3:1, baz = 9:11)
> df1
     foo   bar
   <int> <int>
1:     1     4
2:     2     5
3:     3     6
> df2
     foo   baz
   <int> <int>
1:     3     9
2:     2    10
3:     1    11
> df1[df2, , on = "foo"]
     foo   bar   baz
   <int> <int> <int>
1:     3     6     9
2:     2     5    10
3:     1     4    11
> df1[df2, -"foo", on = "foo"]
     bar
   <int>
1:     6
2:     5
3:     4
> df1[df2, -"bar", on = "foo"]
     foo
   <int>
1:     3
2:     2
3:     1
> df1[df2, -"baz", on = "foo"]
     foo   bar
   <int> <int>
1:     3     6
2:     2     5
3:     1     4
Warning message:
column(s) not removed because not found: [baz]

Output of sessionInfo()

R version 4.2.2 (2022-10-31)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Rocky Linux 8.9 (Green Obsidian)

Matrix products: default
BLAS/LAPACK: /usr/lib64/libopenblasp-r0.3.15.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] data.table_1.15.2

loaded via a namespace (and not attached):
[1] compiler_4.2.2 tools_4.2.2
Dominant language
R
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