error-in-applying-dplyrgroup-by-to-ffdf-class

[AlfredBeit]

library(ffbase2)
library(dplyr)
ds <- tbl_ffdf(mtcars)
g <- group_by(ds, cyl)

Throws error

Error in UseMethod("group_by") : 
  no applicable method for 'group_by' applied to an object of class "c('tbl_ffdf', 'tbl', 'ffdf')"

R version 3.6.3 (2020-02-29)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19042)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    

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

other attached packages:
[1] ffbase2_0.2 dplyr_1.0.6 ff_4.0.4    bit_4.0.4  

loaded via a namespace (and not attached):
 [1] rstudioapi_0.13   magrittr_1.5      tidyselect_1.1.0  ffbase_0.13.3     R6_2.5.0          rlang_0.4.10     
 [7] fastmatch_1.1-0   fansi_0.4.1       tools_3.6.3       xfun_0.22         sessioninfo_1.1.1 tinytex_0.31     
[13] utf8_1.1.4        cli_2.4.0         DBI_1.1.1         withr_2.4.1       ellipsis_0.3.1    lazyeval_0.2.2   
[19] assertthat_0.2.1  tibble_3.0.1      lifecycle_1.0.0   crayon_1.4.1      purrr_0.3.4       vctrs_0.3.6      
[25] glue_1.4.0        compiler_3.6.3    pillar_1.5.1      generics_0.1.0    pkgconfig_2.0.3