update 1.18.2.1 NEWS (#7633)

* 1.18.0 on CRAN. Bump to 1.18.99

* bump versions

* Fix milestone link for 1.18.2

* Replace `ATTRIB`, `SET_ATTRIB` (#7487)

* frev: drop SET_ATTRIB

Instead, backport and use CLEAR_ATTRIB (R >= 4.5).

* mergeIndexAttrib: drop SET_ATTRIB

Use SHALLOW_DUPLICATE_ATTRIB (R >= 3.3) for the simple case. Also,
Backport ANY_ATTRIB (R >= 4.5) instead of testing !isNull(ATTRIB(.)).

* cbindlist: use ANY_ATTRIB

* nafillR: use ANY_ATTRIB

* Backport R_mapAttrib

* anySpecialStatic: switch to R_mapAttrib

* dogroups: construct rownames anew

Instead of trying to walk ATTRIB in search of the compact 'rownames'
attribute to modify, install it anew, take note of the returned
reference to the value being installed (a different one!) and modify
that.

* mergeIndexAttrib: switch to R_mapAttrib

* assign: factor out index fixup

Instead of walking the attribute list directly, use R_mapAttrib().
Create a hash table of index names instead of relying on chin() and a
temporary string vector. Move all temporary allocations onto the R heap.

* assign: drop indexLength

* assign: fix index unmarking

* Comments, better field names

* Update src/dogroups.c

Co-authored-by: Benjamin Schwendinger <[email protected]>

* mapAttrib: protect the attribute value

Otherwise the callback could remove the attribute and end up with the
value unprotected. Protect the attribute tag as well for uniformity.

Co-Authored-By: HughParsonage <[email protected]>

* dogroups: look up rownames using mapAttrib

This solution is closer to the working approach previously taken by the code.

* Fix comment, function name

* Protect the newly found rownames attribute

* add NEWS entry

---------

Co-authored-by: HughParsonage <[email protected]>
Co-authored-by: Benjamin Schwendinger <[email protected]>
Co-authored-by: Michael Chirico <[email protected]>
Co-authored-by: Michael Chirico <[email protected]>

* use getVar over findVar (#7575)

* remove unused vars (#7578)

* Fix code blocks in NEWS.md (#7518)

Add a missing triple-backtick separator.

Separate the indented code blocks from the preceding paragraph because
otherwise Pandoc fails to realise that the whitespace followed by
triple-backtick denotes a fenced code block.

* make rchk happy (#7520)

Co-authored-by: Michael Chirico <[email protected]>

* escape one frollsd tests for valgrind (#7548)

* escape one tests for valgrind

* increment skipped count

* escape proper one

* make test robust to valgrind numerical issues

---------

Co-authored-by: Michael Chirico <[email protected]>

* fix(7571): bug fix for narm issue on gforce in int64 case (#7572)

* fix(7571): bug fix for narm issue on gforce in int64 case

* fix(7571): test sequencing

* fix(7571): updated the NEWS.md

* trailing newline

* Use $V1

* fix(7571): added db optimize 2L

* refine NEWS

* fix(7571): add more tests and change to code similar to int for gsum

* fix(7571): added more tests for mean

* eliminate intermediate variable

* NEWS again

---------

Co-authored-by: Michael Chirico <[email protected]>

* add @manmita (#7573)

* `utils.c`: include `<signal.h>` for `siginfo_t` (#7517)

* utils.c: include <signal.h> for siginfo_t

POSIX says:

> The <signal.h> header shall define the siginfo_t type as a structure

So <sys/wait.h> is not enough to see the definition (not just a forward
declaration) of siginfo_t.

* NEWS entry

* Amend NEWS

* more robustly define _POSIX_C_SOURCE (h/t Hugh)

* tidy up NEWS

* -D_POSIX_C_SOURCE=200809L in gitlab CI job for regression test

* revert gitlab-ci change

---------

Co-authored-by: Michael Chirico <[email protected]>
Co-authored-by: Michael Chirico <[email protected]>

* Remove unrelated release notes

Amend 1c05f11: remove the notes not
relevant to the 1.18.2 release.

* Fix http -> https link that is now a redirect (#7588)

Found the following (possibly) invalid URLs:
  URL: http://stereopsis.com/radix.html (moved to https://stereopsis.com/radix.html)
    From: man/setkey.Rd
          man/setorder.Rd
    Status: 200
    Message: OK

* Fix latest rchk issues (#7585)

* attempt PROTECT for new rchk issues

* different approach for longestLevels

* use nprotect?

* no longer using names SEXP

* only UNPROTECT near exit

* no, that cant be it...

* move assignment into loop

* REPROTECT approach

* reduce diff

* reduce diff

* set automatically allocates new column slots if needed (#7538)

* set automatically allocates new column slots if needed

* use GetOption1 instead of GetOption

* fix test

* change froll test

* remove assign change

* add output statements to test loop

* add helper function

* frollmedianFast: avoid reading uninitialised array (#7589)

The 'n' array is only initialised if 'even' is true, so skip the
comparisons otherwise. Detected by checking with --use-valgrind or
performing a frollmedian() with an odd window size under R -d valgrind.

Fixes: #7546

* `setlevels()`: avoid crash on missing factor values (#7596)

Check for missing or out of bounds values and set them to NA.

* Avoid out-of-bounds access in `overlaps` (#7598)

* Add tests

* overlaps: avoid accessing length-0 vectors in ux

If 'ux' contains 0 rows, pretend that all comparisons against its
non-existent elements fail.

* overlaps: avoid 'lookup' list overflow

This used to happen when from[i] was 0. (No match on non-range columns?)

* NEWS entry

* overlaps: uncomment one more underflow test

Technically this one was harmless (and thus not caught by sanitizers)
because the preceding VECSEXP header always contained a 0, preventing
the branch where VECTOR_ELT() would be called with a negative index.

* test formatting

* Update src/ijoin.c

Co-authored-by: Benjamin Schwendinger <[email protected]>

* Update src/ijoin.c

Co-authored-by: Benjamin Schwendinger <[email protected]>

* Update src/ijoin.c

Co-authored-by: Benjamin Schwendinger <[email protected]>

* Update inst/tests/tests.Rraw

* overlaps: uncomment the remaining underflow test

The underflow is covered by already existing tests.

---------

Co-authored-by: Benjamin Schwendinger <[email protected]>

* Only export R_init_data_table (#7607)

This will avoid name clashes between data.table functions (now hidden)
and other functions in the global namespace visible to the shared
library loader.

Fixes: #7605

* `set()`: only reallocate the table if resizing would fail otherwise (#7606)

* Regression tests

* set(): only reallocate if resizing would fail

* Update R/data.table.R

Co-authored-by: Michael Chirico <[email protected]>

* Rename test variables

Co-Authored-By: Michael Chirico <[email protected]>

* Cache j %chin% names(x)

Co-Authored-By: Benjamin Schwendinger <[email protected]

---------

Co-authored-by: Michael Chirico <[email protected]>
Co-authored-by: Michael Chirico <[email protected]>

* NEWS entry for #7607 (#7608)

* NEWS entry for #7607

* More about the problem being solved

Co-Authored-By: Benjamin Schwendinger <[email protected]>

* `tests/froll.R`: disable `mcparallel` under Valgrind (#7621)

* update NEWS

* fix merge

---------

Co-authored-by: Tyson Barrett <[email protected]>
Co-authored-by: aitap <[email protected]>
Co-authored-by: HughParsonage <[email protected]>
Co-authored-by: Michael Chirico <[email protected]>
Co-authored-by: Michael Chirico <[email protected]>
Co-authored-by: Jan Gorecki <[email protected]>
Co-authored-by: Manmita Das <[email protected]>

Author: 7 people

NEWS.md

@@ -30,39 +30,45 @@
 
 1. `fread()` with `skip=0` and `(header=TRUE|FALSE)` no longer skips the first row when it has fewer fields than subsequent rows, [#7463](https://github.com/Rdatatable/data.table/issues/7463). Thanks @emayerhofer for the report and @ben-schwen for the fix.
 
-2. `set()` now automatically pre-allocates new column slots if needed, similar to what `:=` already does, [#1831](https://github.com/Rdatatable/data.table/issues/1831) [#4100](https://github.com/Rdatatable/data.table/issues/4100). Thanks to @zachokeeffe and @tyner for the report and @ben-schwen for the fix.
+2. `fread("file://...")` works for file URIs with spaces, [#7550](https://github.com/Rdatatable/data.table/issues/7550). Thanks @aitap for the report and @MichaelChirico for the PR.
 
-3. `fread("file://...")` works for file URIs with spaces, [#7550](https://github.com/Rdatatable/data.table/issues/7550). Thanks @aitap for the report and @MichaelChirico for the PR.
+3. `fread(text=)` could segfault when reading text input ending with a `\x1a` (ASCII SUB) character after a long line, [#7407](https://github.com/Rdatatable/data.table/issues/7407) which is solved by adding check for eof. Thanks @aitap for the report and @manmita for the fix.
 
-4. `sum(<int64 column>)` by group is correct with missing entries and GForce activated ([#7571](https://github.com/Rdatatable/data.table/issues/7571)). Thanks to @rweberc for the report and @manmita for the fix. The issue was caused by a faulty early `break` that spilled between groups, and resulted in silently incorrect results!
+4. `rowwiseDT()` now provides a helpful error message when a complex object that is not a list (e.g., a function) is provided as a cell value, instructing the user to wrap it in `list()`, [#7219](https://github.com/Rdatatable/data.table/issues/7219). Thanks @kylebutts for the report and @venom1204 for the fix.
 
-5. `fread(text=)` could segfault when reading text input ending with a `\x1a` (ASCII SUB) character after a long line, [#7407](https://github.com/Rdatatable/data.table/issues/7407) which is solved by adding check for eof. Thanks @aitap for the report and @manmita for the fix.
+### Notes
 
-6. `rowwiseDT()` now provides a helpful error message when a complex object that is not a list (e.g., a function) is provided as a cell value, instructing the user to wrap it in `list()`, [#7219](https://github.com/Rdatatable/data.table/issues/7219). Thanks @kylebutts for the report and @venom1204 for the fix.
+1. {data.table} now depends on R 3.5.0 (2018).
 
-7. Fixed compilation failure like "error: unknown type name 'siginfo_t'" in v1.18.0 in some strict environments, e.g., FreeBSD, where the header file declaring the POSIX function `waitid` does not transitively include the header file defining the `siginfo_t` type, [#7516](https://github.com/rdatatable/data.table/issues/7516). Thanks to @jszhao for the report and @aitap for the fix.
+2. pydatatable compatibility layer in `fread()` and `fwrite()` has been removed, [#7069](https://github.com/Rdatatable/data.table/issues/7069). Thanks @badasahog for the report and the PR.
 
-8. When fixing duplicate factor levels, `setattr()` no longer crashes upon encountering missing factor values, [#7595](https://github.com/Rdatatable/data.table/issues/7595). Thanks to @sindribaldur for the report and @aitap for the fix.
+3. Vignettes are now built using `litedown` instead of `knitr`, [#6394](https://github.com/Rdatatable/data.table/issues/6394). Thanks @jangorecki for the suggestion and @ben-schwen and @aitap for the implementation.
 
-9. `foverlaps()` no longer crashes due to out-of-bounds access to list and integer vectors when `y` has no rows or the non-range part of the join fails, [#7597](https://github.com/Rdatatable/data.table/issues/7597). Thanks to @nextpagesoft for the report and @aitap for the fix.
+4. The data.table test suite is a bit more robust to lacking UTF-8 support via a new `requires_utf8` argument to `test()` to skip tests when UTF-8 support is not available, [#7336](https://github.com/Rdatatable/data.table/issues/7336). Thanks @MichaelChirico for the suggestion and @ben-schwen for the implementation.
 
-10. The dynamic library now exports only `R_init_data_table`, preventing symbol name conflicts like `hash_create` with PostgreSQL, [#7605](https://github.com/Rdatatable/data.table/issues/7605). Thanks to @ced75 for the report and @aitap for the fix.
+5. `melt()` and `dcast()` no longer provide nudges when receiving incompatible inputs (e.g. data.frames). As of now, we only define methods for `data.table` inputs.
 
-### Notes
+## data.table [v1.18.2.1](https://github.com/Rdatatable/data.table/milestone/44?closed=1)  (22 January 2026)
 
-1. {data.table} now depends on R 3.5.0 (2018).
+### BUG FIXES
 
-2. pydatatable compatibility layer in `fread()` and `fwrite()` has been removed, [#7069](https://github.com/Rdatatable/data.table/issues/7069). Thanks @badasahog for the report and the PR.
+1. When fixing duplicate factor levels, `setattr()` no longer crashes upon encountering missing factor values, [#7595](https://github.com/Rdatatable/data.table/issues/7595). Thanks to @sindribaldur for the report and @aitap for the fix.
 
-3. Vignettes are now built using `litedown` instead of `knitr`, [#6394](https://github.com/Rdatatable/data.table/issues/6394). Thanks @jangorecki for the suggestion and @ben-schwen and @aitap for the implementation.
+2. `foverlaps()` no longer crashes due to out-of-bounds access to list and integer vectors when `y` has no rows or the non-range part of the join fails, [#7597](https://github.com/Rdatatable/data.table/issues/7597). Thanks to @nextpagesoft for the report and @aitap for the fix.
+
+3. The dynamic library now exports only `R_init_data_table`, preventing symbol name conflicts like `hash_create` with PostgreSQL, [#7605](https://github.com/Rdatatable/data.table/issues/7605). Thanks to @ced75 for the report and @aitap for the fix
+
+### Notes
+
+1. Removed use of non-API `ATTRIB`, `SET_ATTRIB`, and `findVar` [#6180](https://github.com/Rdatatable/data.table/issues/6180). Thanks @aitap for the continued assiduous work here, and @MichaelChirico for the easy fix to replace `findVar` with `R_getVar`.
 
-4. Removed use of non-API `ATTRIB`, `SET_ATTRIB`, and `findVar` [#6180](https://github.com/Rdatatable/data.table/issues/6180). Thanks @aitap for the continued assiduous work here, and @MichaelChirico for the easy fix to replace `findVar` with `R_getVar`.
+2. Fixed compilation failure like "error: unknown type name 'siginfo_t'" in v1.18.0 in some strict environments, e.g., FreeBSD, where the header file declaring the POSIX function `waitid` does not transitively include the header file defining the `siginfo_t` type, [#7516](https://github.com/rdatatable/data.table/issues/7516). Thanks to @jszhao for the report and @aitap for the fix.
 
-5. The data.table test suite is a bit more robust to lacking UTF-8 support via a new `requires_utf8` argument to `test()` to skip tests when UTF-8 support is not available, [#7336](https://github.com/Rdatatable/data.table/issues/7336). Thanks @MichaelChirico for the suggestion and @ben-schwen for the implementation.
+3. `sum(<int64 column>)` by group is correct with missing entries and GForce activated ([#7571](https://github.com/Rdatatable/data.table/issues/7571)). Thanks to @rweberc for the report and @manmita for the fix. The issue was caused by a faulty early `break` that spilled between groups, and resulted in silently incorrect results!
 
-6. `melt()` and `dcast()` no longer provide nudges when receiving incompatible inputs (e.g. data.frames). As of now, we only define methods for `data.table` inputs.
+4. `set()` now automatically pre-allocates new column slots if needed, similar to what `:=` already does, [#1831](https://github.com/Rdatatable/data.table/issues/1831) [#4100](https://github.com/Rdatatable/data.table/issues/4100). Thanks to @zachokeeffe and @tyner for the report and @ben-schwen for the fix.
 
-## data.table [v1.18.0](https://github.com/Rdatatable/data.table/milestone/37?closed=1)  23 December 2025
+## data.table [v1.18.0](https://github.com/Rdatatable/data.table/milestone/37?closed=1)  (23 December 2025)
 
 ### BREAKING CHANGE