Rdatatable/data.table

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R's data.table package extends data.frame:

Stars: 3.9k
Forks: 1.1k
Open beginner issues: 5
Indexed issues: 868
Avg merge: 14h 4m
Merged PRs (30d): 4

Dominant language: R
License: MPL-2.0
Last GitHub push: Sep 10, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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868 open issues indexed

fread(text = ..., yaml = TRUE) fails with "cannot open file" when input is a scalar character string with newlines Open

bug fread

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Rdatatable/data.table#7896 · 1 reaction · Opened Sep 2, 2026
frollapply could optionally use mirai+mori rather than base R parallel's fork Open

feature request froll parallel

Difficulty 5/5 Over a week Newbie friendliness 35/100

Rdatatable/data.table#7891 · 1 reaction · Opened Aug 25, 2026
all.equal could have option to sub-aggregate before comparison Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 45/100

Rdatatable/data.table#7890 · Opened Aug 25, 2026
as.data.table() recurses without end on a survival::Surv object (or any data.frame carrying one) Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

Rdatatable/data.table#7887 · Opened Aug 23, 2026
CJ(letters, letters) fails (duplicate column name) Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Rdatatable/data.table#7873 · 2 comments · Opened Jul 31, 2026
frollsd on ancient Windows can give NaN where NA is intended Open

consistency froll platform-specific

Rdatatable/data.table#7854 · 2 reactions · 1 assignee · Opened Jul 28, 2026
test() doesn't distinguish plain NA_real_, NaN Open

consistency tests

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

Rdatatable/data.table#7853 · 3 comments · Opened Jul 28, 2026
test() should error on uncaught output Open

beginner-task tests

Difficulty 3/5 1-2 days Newbie friendliness 52/100

Rdatatable/data.table#7847 · Opened Jul 26, 2026
Show x,y diff holistically in test() failure Open

tests

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Rdatatable/data.table#7843 · Opened Jul 26, 2026
.SD in grouped operations causes update() to refit on wrong data subset Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Rdatatable/data.table#7831 · 3 comments · Opened Jul 23, 2026
all.equal.data.table throws "Dataset 'current' has rows not present in 'target'" when double precision values are numerically, but not exactly, equal Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Rdatatable/data.table#7816 · 3 comments · Opened Jul 15, 2026
Another post-rows-deletion-by-reference FR/suggestion Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

Rdatatable/data.table#7812 · 1 comment · Opened Jul 11, 2026
fread causing r to crash when assigning to variable in R 4.6.1 Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Rdatatable/data.table#7811 · 9 comments · Opened Jul 10, 2026
Issue with modifying an empty nested table Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Rdatatable/data.table#7806 · Opened Jul 1, 2026
S7 and a new `:=` named-bind operator Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

Rdatatable/data.table#7801 · 2 comments · 2 reactions · Opened Jun 24, 2026
long column names go past width Open

print

Difficulty 3/5 1-2 days Newbie friendliness 62/100

Rdatatable/data.table#7797 · 1 comment · Opened Jun 19, 2026
remove capture.output from tests Open

beginner-task tests

Rdatatable/data.table#7792 · 1 comment · 1 reaction · 1 assignee · Opened Jun 17, 2026
Slower `fsetdiff` vs `dplyr::setdiff` Open

atime

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Rdatatable/data.table#7783 · 3 comments · 1 reaction · Opened Jun 7, 2026
Time units in progress messages Open

beginner-task

Difficulty 3/5 1-2 days Newbie friendliness 58/100

Rdatatable/data.table#7772 · 2 comments · 2 reactions · Opened Jun 1, 2026
5 packages fail checks after prohibiting duplicate key columns Open

revdep

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Rdatatable/data.table#7770 · 10 comments · Opened May 30, 2026
Should nafill/setnafill allow coercsion and/or have more verbose warning messages? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Rdatatable/data.table#7757 · 2 comments · Opened May 22, 2026
Outdated pieces of vignettes Open

beginner-task documentation

Rdatatable/data.table#7755 · 1 comment · 1 assignee · Opened May 21, 2026
Broken relative links at `r-datatable.com` Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 52/100

Rdatatable/data.table#7747 · 1 reaction · Opened May 10, 2026
`litedown`-rendered man pages could have pre-run examples Open

documentation

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Rdatatable/data.table#7746 · 1 reaction · Opened May 10, 2026
Release data.table 1.19.0 Open

release

Difficulty 5/5 Over a week Newbie friendliness 20/100

Rdatatable/data.table#7740 · 1 comment · 4 reactions · Opened May 6, 2026
print.trunc.cols shows nothing if first column is too long Open

beginner-task print

Rdatatable/data.table#7717 · 1 comment · 1 assignee · Opened Apr 21, 2026
print.trunc.cols off by one? Open

beginner-task print

Difficulty 3/5 1-2 days Newbie friendliness 48/100

Rdatatable/data.table#7716 · 1 comment · Opened Apr 21, 2026
datatable.prettyprint.char could use ellipsis (…) instead of three dots Open

beginner-task print

Rdatatable/data.table#7715 · 8 comments · 1 assignee · Opened Apr 21, 2026
Scoping / Documentation / Context issues -- How to be specific? Open

programming question

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Rdatatable/data.table#7709 · 5 comments · Opened Apr 15, 2026
timetaken() could have more formatting options Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Rdatatable/data.table#7708 · Opened Apr 15, 2026
Any Claude Code Skills for data.table Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

Rdatatable/data.table#7703 · 4 comments · 2 reactions · Opened Apr 10, 2026
Happy birthday data.table! Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

Rdatatable/data.table#7698 · 13 comments · 17 reactions · Opened Apr 5, 2026
git bisect for performance tests Open

atime

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Rdatatable/data.table#7688 · Opened Mar 31, 2026
gwhich.max: GForce which min/max Open

feature request GForce

Rdatatable/data.table#7678 · 3 comments · 1 assignee · Opened Mar 21, 2026
No `by` argument when merging lists of data.tables Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Rdatatable/data.table#7676 · 3 comments · Opened Mar 20, 2026
fread memory maps entire file even when select= is used to restrict to specific columns Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Rdatatable/data.table#7675 · 4 comments · Opened Mar 20, 2026
revdeprun blog Open

revdep

Difficulty 5/5 Over a week Newbie friendliness 30/100

Rdatatable/data.table#7665 · 5 comments · Opened Mar 10, 2026
revdeps break after frollapply deprecation Open

revdep

Difficulty 4/5 3-5 days Newbie friendliness 30/100

Rdatatable/data.table#7660 · 2 comments · Opened Mar 3, 2026
fread quote = "\"" does not work as expected Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Rdatatable/data.table#7656 · 2 comments · Opened Mar 3, 2026
`fwrite(dateTimeAs = "write.csv")` is not aligned with `write.csv()` Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

Rdatatable/data.table#7653 · Opened Feb 27, 2026
Could we tag more beginner-task issues? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

Rdatatable/data.table#7649 · 6 comments · 1 reaction · Opened Feb 25, 2026
Use "dbl" for Doubles Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

Rdatatable/data.table#7645 · 1 comment · Opened Feb 21, 2026
`round.ITime` fails when given numeric `digits` by `xfun::md_table` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

Rdatatable/data.table#7638 · 1 comment · Opened Jan 31, 2026
Number of rows and list columns with NULL Open

bug non-atomic column

Difficulty 3/5 1-2 days Newbie friendliness 62/100

Rdatatable/data.table#7637 · 2 comments · Opened Jan 29, 2026
add `cols` argument to `rbindlist` Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Rdatatable/data.table#7627 · 2 comments · Opened Jan 25, 2026
Move `INTEGER`/`REAL`/other accessors out of loops Open

code-quality

Difficulty 4/5 3-5 days Newbie friendliness 35/100

Rdatatable/data.table#7623 · Opened Jan 24, 2026
“EXPLAIN / profiling” support for [i, j, by] to diagnose performance bottlenecks Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

Rdatatable/data.table#7620 · 2 comments · Opened Jan 22, 2026
Should we add an accessor for `integer64`? Open

bit64

Difficulty 4/5 3-5 days Newbie friendliness 35/100

Rdatatable/data.table#7618 · 8 comments · 1 reaction · Opened Jan 22, 2026
sort.data.table method Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

Rdatatable/data.table#7616 · 11 comments · Opened Jan 21, 2026
Need a CI check with `--std=c99` set Open

ci

Difficulty 3/5 1-2 days Newbie friendliness 42/100

Rdatatable/data.table#7599 · 3 comments · Opened Jan 15, 2026

Rdatatable/data.table

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