Vector memory exhausted

[marciz]

library(vroom)
x <- data.frame(a = 1:1e7, b = as.character(1:1e7))
tfile <- tempfile()
vroom_write(x = x, path = tfile)

Error: vector memory exhausted (limit reached?)
Error: vector memory exhausted (limit reached?)
*** recursive gc invocation
Error: cannot get ALTSTRING_ELT during GC

R version 4.0.2 (2020-06-22)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18362)

Matrix products: default

locale:
[1] LC_COLLATE=Latvian_Latvia.1257 LC_CTYPE=Latvian_Latvia.1257
[3] LC_MONETARY=Latvian_Latvia.1257 LC_NUMERIC=C
[5] LC_TIME=Latvian_Latvia.1257

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

other attached packages:
[1] vroom_1.3.1

loaded via a namespace (and not attached):
[1] crayon_1.3.4 dplyr_1.0.2 R6_2.4.1 lifecycle_0.2.0 magrittr_1.5
[6] pillar_1.4.6 httr_1.4.2 rlang_0.4.7 rstudioapi_0.11 ellipsis_0.3.1
[11] generics_0.0.2 vctrs_0.3.4 tools_4.0.2 bit64_4.0.5 glue_1.4.2
[16] purrr_0.3.4 tinytex_0.26 bit_4.0.4 xfun_0.17 compiler_4.0.2
[21] pkgconfig_2.0.3 tidyselect_1.1.0 tibble_3.0.3

No issue with R version 3.6.1 & vroom 1.2.0

[jimhester]

This isn't due to any changes in vroom, it is because in R 4.0+ as.character(1:1e7) is a ALTREP vector, whereas in R 3.6.1 it is a normal vector. vroom 1.2.0 with R 4.0 exhibits the same behavior.