weird exception when by contains get
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
No source file or test is named. Start by running the supplied data.table example and compare the filtered and unfiltered grouping expressions; done means the filtered expression no longer raises the “object 'z' not found” error and produces the expected grouped result.
Written by the indexing model from the issue text.
Description
Just copied my question on stackoverflow:
get function usually works without problems in data.table, but I am not able to understand the reason of this bug.
library(data.table)
tb<-data.table(x=c(1,2), y=c(3,4), z=c(5,6), w=c("a","b"))
tb[w != "b", .(x=sum(x)), by=.(y, zz=z)] #OK
# y zz x
# 1: 3 5 1
tb[, .(x=sum(x)), by=.(y, zz=get("z"))] #OK
# y zz x
# 1: 3 5 1
# 2: 4 6 2
tb[w != "b", .(x=sum(x)), by=.(y, zz=get("z"))] #not OK?!
Error in get("z") : object 'z' not found
(I use R version 3.3.2 and data.table version 1.9.6.)
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