jonkeane commented on code in PR #45507:
URL: https://github.com/apache/arrow/pull/45507#discussion_r1959792460
##########
dev/tasks/r/github.linux.arrow.version.back.compat.yml:
##########
@@ -66,7 +66,19 @@ jobs:
read-files:
name: "Read files with Arrow {{ '${{ matrix.config.old_arrow_version }}'
}}"
needs: [write-files]
- runs-on: ubuntu-20.04
+ # condition && true-case || false-case
+ # ==
+ # condition ? true-case : false-case
+ #
+ # We use Ubuntu 20.04 for 3.0.0 or earlier because 3.0.0 or
+ # earlier can't be built on Ubuntu 22.04. We will drop 3.0.0 or
+ # earlier when Ubuntu 20.04 is unavailable on GitHub Actions.
Review Comment:
Thanks for this comment + the helpful hint about how these work — I always
have to go and look these up when I edit them.
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