jonkeane commented on code in PR #46124:
URL: https://github.com/apache/arrow/pull/46124#discussion_r2045083661


##########
docker-compose.yml:
##########
@@ -1745,6 +1746,34 @@ services:
       /bin/bash -c "
         /arrow/ci/scripts/r_sanitize.sh /arrow"
 
+  r-clang-ubsan:
+    image: ${REPO}:r-rhub-clang-ubsan-devel-latest
+    build:
+      context: .
+      dockerfile: ci/docker/linux-r.dockerfile
+      cache_from:
+        - ${REPO}:r-rhub-clang-ubsan-devel-latest
+      args:
+        base: rhub/clang-ubsan
+        cmake: ${CMAKE}
+        r_dev: ${ARROW_R_DEV}
+        r_bin: R
+        tz: ${TZ}
+        r_prune_deps: ${R_PRUNE_DEPS}
+    shm_size: *shm-size
+    environment:
+      <<: *common
+      LIBARROW_DOWNLOAD: "false"
+      ARROW_SOURCE_HOME: "/arrow"
+      ARROW_R_DEV: ${ARROW_R_DEV}
+      # To test for CRAN release, delete ^^ these two env vars so we download 
the Apache release

Review Comment:
   FWIW, I don't think we ever (need) to do this. IMHO I would say let's remove 
this + the other sanitizer copy/pasta version of this and we can leave it up 
top where it is under the one R docker file.
   
   It was introduced with https://github.com/apache/arrow/pull/6995 and I don't 
think we've every really messed with it since. It's good to have an idea of 
what one might do to actually run the full real version, but we test it in 
other ways in our CI  



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