Weird groups when using "fill" parameter

[hejian41]

Hi, when using "fill" as an aesthetic, I encountered unexpected grouped boxplots or violin plots. The outputs were varied after executing the following codes each time:

ggplot(data = diamonds, mapping = aes(x = cut, y = price, fill = color)) +
geom_boxplot()

first executing:

second executing:

Also, it produces warning messages:

Warning message:
The following aesthetics were dropped during statistical transformation: fill.
i This can happen when ggplot fails to infer the correct grouping structure in the data.
i Did you forget to specify a group aesthetic or to convert a numerical variable into a factor?

However, it would be fine if I subset the top 8000 rows.

ggplot(data = diamonds[1:8000,], mapping = aes(x = cut, y = price, fill = color)) +
geom_violin()

_sessionInfo()

R version 4.5.2 (2025-10-31)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 22.04.5 LTS

Matrix products: default
BLAS/LAPACK: /usr/lib/x86_64-linux-gnu/libmkl_rt.so; LAPACK version 3.8.0

locale:
[1] C

time zone: Asia/Shanghai
tzcode source: system (glibc)

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

other attached packages:
[1] lubridate_1.9.4 forcats_1.0.1 stringr_1.6.0 dplyr_1.1.4 purrr_1.1.0 readr_2.1.5 tidyr_1.3.1 tibble_3.3.0 tidyverse_2.0.0 ggpubr_0.6.2 ggplot2_4.0.1

loaded via a namespace (and not attached):
[1] generics_0.1.4 rstatix_0.7.2 stringi_1.8.7 hms_1.1.4 digest_0.6.39 magrittr_2.0.4 timechange_0.3.0 evaluate_1.0.5 grid_4.5.2
[10] RColorBrewer_1.1-3 fastmap_1.2.0 backports_1.5.0 Formula_1.2-5 scales_1.4.0 abind_1.4-8 cli_3.6.5 rlang_1.1.6 pak_0.9.0
[19] withr_3.0.2 yaml_2.3.10 tools_4.5.2 tzdb_0.5.0 ggsignif_0.6.4 broom_1.0.11 vctrs_0.6.5 R6_2.6.1 lifecycle_1.0.4
[28] car_3.1-3 pkgconfig_2.0.3 pillar_1.11.0 gtable_0.3.6 glue_1.8.0 xfun_0.54 tidyselect_1.2.1 rstudioapi_0.17.1 knitr_1.50
[37] farver_2.1.2 htmltools_0.5.9 rmarkdown_2.29 carData_3.0-5 labeling_0.4.3 compiler_4.5.2 S7_0.2.1_

[teunbrand]

Thanks for the report!

When I execute the code, I get normal looking boxplots.

library(ggplot2)
#> Warning: package 'ggplot2' was built under R version 4.5.2
ggplot(data = diamonds, mapping = aes(x = cut, y = price, fill = color)) +
  geom_boxplot()

^{Created on 2026-01-13 with reprex v2.1.1}

[hejian41]

Thanks for the report!

When I execute the code, I get normal looking boxplots.

library(ggplot2)
#> Warning: package 'ggplot2' was built under R version 4.5.2
ggplot(data = diamonds, mapping = aes(x = cut, y = price, fill = color)) +
geom_boxplot()

Created on 2026-01-13 with reprex v2.1.1

Thanks for the reply. I found that the error was caused by the misuse of libmkl, and it is the same as issues #5840 and #4805.