GH-49901: [R] Bump minimum supported R version to 4.2 now that 4.6 is out by thisisnic · Pull Request #49929 · apache/arrow

thisisnic · 2026-05-05T19:10:01Z

Rationale for this change

We don't need to support R 4.1 as a new version is out

What changes are included in this PR?

Bump minimum supported version to 4.2

Are these changes tested?

In CI, sure

Are there any user-facing changes?

Nope

GitHub Issue: [R] Bump minimum supported R version to 4.2 now that 4.6 is out #49901

thisisnic · 2026-05-05T19:10:54Z

        run: |
-          # RTools 40 uses GCC 8.x which does not support C++20 chrono timezones,
-          # so Arrow uses the vendored date library which requires tzdata
+          # Download tzdata in case the vendored date library is used for timezones


Does the RTools bump and associated GCC version increase means that this is no longer needed?

@amoeba would know more than I do, but I think we still need to workaround the tz file issue, but we now do that with an R package instead of the C++ program thing here. Or am I confused about that?

I updated the comment to be clearer now.

I think we can remove this, but a separate PR is fine. We still need to use this script in other CI jobs where R isn't involved.

thisisnic · 2026-05-05T19:11:11Z

-{% set r_release = {"ver": "4.2", "rt" : "42"} %}
-{% set r_oldrel = {"ver": "4.1", "rt" : "40"} %}


These variables are never used anywhere

thisisnic · 2026-05-05T19:11:41Z

@github-actions crossbow submit -g r

github-actions · 2026-05-05T19:14:31Z

Revision: 682fe0a

Submitted crossbow builds: ursacomputing/crossbow @ actions-8480702cfb

Task	Status
r-binary-packages
r-recheck-most
test-r-alpine-linux-cran
test-r-arrow-backwards-compatibility
test-r-depsource-system
test-r-dev-duckdb
test-r-devdocs
test-r-extra-packages
test-r-fedora-clang
test-r-gcc-11
test-r-gcc-12
test-r-install-local
test-r-install-local-minsizerel
test-r-linux-as-cran
test-r-linux-rchk
test-r-linux-sanitizers
test-r-linux-valgrind
test-r-m1-san
test-r-macos-as-cran
test-r-offline-maximal
test-r-ubuntu-22.04
test-r-versions

thisisnic · 2026-05-05T21:32:51Z

+# Ensure CA certificates are available for pacman (Rtools42+ may not bundle them)
+if [ ! -f /usr/ssl/certs/ca-bundle.crt ]; then
+  mkdir -p /usr/ssl/certs
+  for src in /c/rtools45/usr/ssl/certs/ca-bundle.crt \
+             "/c/Program Files/Git/mingw64/etc/ssl/certs/ca-bundle.crt"; do
+    if [ -f "$src" ]; then
+      cp "$src" /usr/ssl/certs/ca-bundle.crt
+      break
+    fi
+  done
+fi


Claude addition as job fails if we don't do this - unsure if best approach but looks like a CI-specific failure and will see if it makes the CI pass.

Rtools42 definitely bundles these so something else must be going on. I just checked by installing Rtools42 and /usr/ssl/certs is all set up and pacman works fine.

Thanks for checking, will push some changes which print paths etc to see more of what's happening.

jonkeane · 2026-05-06T12:12:36Z

Are those two crossbow failures on main too? Do we have issues for them?

raulcd · 2026-05-06T12:35:15Z

Are those two crossbow failures on main too? Do we have issues for them?

Yes, they've been failing on the nightlies for ~a week. See:
https://s3.amazonaws.com/arrow-data/index.html

thisisnic · 2026-05-06T14:42:06Z

The test-r-arrow-backwards-compatibility failure is because there are no binaries available from P3M for those Arrow versions and so we build from source with no Arrow C++ libraries and get failures. Given those versions of Arrow are ancient now, I'll remove the CI job like we did with the older ones in #46294

thisisnic · 2026-05-06T14:43:05Z

@github-actions crossbow submit test-r-arrow-backwards-compatibility

github-actions · 2026-05-06T14:45:24Z

Revision: ce6d929

Submitted crossbow builds: ursacomputing/crossbow @ actions-756eb23241

Task	Status
test-r-arrow-backwards-compatibility

thisisnic · 2026-05-06T14:58:03Z

The ticket for test-r-macos-as-cran is #49941

jonkeane · 2026-05-06T15:22:50Z

Is the R / AMD64 Windows C++ RTools 42 ucrt64 failure on main too?

thisisnic · 2026-05-06T19:09:40Z

Is the R / AMD64 Windows C++ RTools 42 ucrt64 failure on main too?

Nope, good spot, this is the one I'm trying to fix with the CA certificate shenanigans that RTools42 dislikes. Will iterate to see if I can sort it.

thisisnic added 4 commits May 5, 2026 15:06

Remove unused variables

8ba5029

Ditch 4.1

68b6f69

Bump 4.1 to 4.2

dadc34c

Bump rtools version

682fe0a

thisisnic requested review from assignUser, jonkeane, kou and raulcd as code owners May 5, 2026 19:10

github-actions Bot added awaiting committer review Awaiting committer review Component: R labels May 5, 2026

thisisnic commented May 5, 2026

View reviewed changes

github-actions Bot added awaiting changes Awaiting changes and removed awaiting committer review Awaiting committer review labels May 5, 2026

thisisnic added 2 commits May 5, 2026 17:27

Remove pre 4.1 versions

7782075

Ensure CA certificates for pacman are installed

ce6d929

thisisnic commented May 5, 2026

View reviewed changes

github-actions Bot added awaiting change review Awaiting change review awaiting changes Awaiting changes and removed awaiting changes Awaiting changes awaiting change review Awaiting change review labels May 5, 2026

Update comment

2ea2bde

github-actions Bot added awaiting change review Awaiting change review awaiting changes Awaiting changes and removed awaiting changes Awaiting changes awaiting change review Awaiting change review labels May 6, 2026

Use Git for Windows CA bundle

c3599c7

github-actions Bot added awaiting change review Awaiting change review and removed awaiting changes Awaiting changes labels May 6, 2026

add key bits to PATH

4270ba7

dump output to see what's going on

41acb2e

github-actions Bot added awaiting changes Awaiting changes awaiting change review Awaiting change review and removed awaiting change review Awaiting change review awaiting changes Awaiting changes labels May 6, 2026

		{% set r_release = {"ver": "4.2", "rt" : "42"} %}
		{% set r_oldrel = {"ver": "4.1", "rt" : "40"} %}

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