Error: C stack usage 15923760 is too close to the limit (probably do to noquote)
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 35/100
Research direction
Start with the minimal reproducible example using data.table, .SD, lapply, and noquote, and compare it with the working lapply(AB[, .SD], fun) expression. Trace the data.table evaluation path for the failing call and add a regression test showing that it no longer exhausts the C stack while preserving the working behavior.
Written by the indexing model from the issue text.
Description
Seems to be a problem with noquote:
# [Minimal reproducible example]
library(data.table)
A <- rep("A", 50)
B <- rep("B", 50)
AB <- data.table(A, B)
fun <- function(x) noquote(as.matrix(x))
AB[, lapply(.SD, fun)] # not OK
#Error: C stack usage 15923760 is too close to the limit`
But the following works fine:
lapply(AB[, .SD], fun) # OK
# Output of sessionInfo()
`R version 4.0.0 (2020-04-24)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 17763)
Matrix products: default
locale:
[1] LC_COLLATE=Swedish_Sweden.1252 LC_CTYPE=Swedish_Sweden.1252 LC_MONETARY=Swedish_Sweden.1252
[4] LC_NUMERIC=C LC_TIME=Swedish_Sweden.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] data.table_1.12.8
loaded via a namespace (and not attached):
[1] compiler_4.0.0 tools_4.0.0 `
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