Automatic indexing %in% list()

[gsee]

With automatic indexing turned on, if you have a data.table, DT, with a character column called col and you use syntax like DT[col %in% list("A", "B")] and there is no "A" in col, you will get no results even if "B" is in col. Here is an example:

require(data.table)
op <- options(datatable.auto.index=TRUE)
DT <- as.data.table(cars)
DT[speed %in% list(4, 1)]  # This works because 4 is in `speed`
#   speed dist
#1:     4    2
#2:     4   10
DT <- as.data.table(cars) # Incorrectly gives no results because 1 is not in `speed`
DT[speed %in% list(1, 4)]
#Empty data.table (0 rows) of 2 cols: speed,dist

If you turn automatic indexing off, you'll get the correct results

options(datatable.auto.index=FALSE)
DT[speed %in% list(1, 4)]
#   speed dist
#1:     4    2
#2:     4   10

options(op)

p.s. I know it's awkward to use col %in% list() instead of col %in% c()
p.p.s. The posting guidelines almost imply that I have the ability to add a label to my issue, but I don't think I do.

sessionInfo()
# R version 3.1.1 (2014-07-10)
# Platform: x86_64-pc-linux-gnu (64-bit)
# 
# locale:
#  [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C         LC_TIME=C            LC_COLLATE=C        
#  [5] LC_MONETARY=C        LC_MESSAGES=C        LC_PAPER=C           LC_NAME=C           
#  [9] LC_ADDRESS=C         LC_TELEPHONE=C       LC_MEASUREMENT=C     LC_IDENTIFICATION=C 
# 
# attached base packages:
# [1] stats     graphics  grDevices utils     datasets  methods   base     
# 
# other attached packages:
# [1] data.table_1.9.5
# 
# loaded via a namespace (and not attached):
# [1] chron_2.3-45 tools_3.1.1