jonkeane commented on code in PR #45507:
URL: https://github.com/apache/arrow/pull/45507#discussion_r1956204397


##########
dev/tasks/r/github.linux.arrow.version.back.compat.yml:
##########
@@ -89,7 +89,7 @@ jobs:
         - { old_arrow_version: '1.0.1', r: '4.0' }
     env:
       ARROW_R_DEV: "TRUE"
-      RSPM: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest";
+      RSPM: "https://packagemanager.rstudio.com/cran/__linux__/jammy/latest";

Review Comment:
   > it may be better that we do this backward compatibility test in C++ not 
R...
   
   Yeah, totally. There are some R-specific pieces of metadata that it's nice 
to test, but if we did have c++ compatibility testing for the underlying 
parquet implementation, the decision to drop 1.0.1 - 5.0.0 testing for R does 
become less of a worry (yes, the R-specific metadata _might_ not work, but 
that's also not _so catastrophic_)
   



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