[GitHub] [arrow] ianmcook commented on a change in pull request #10254: ARROW-12660: [R] release cleanup

[GitBox <gi...@apache.org>]

ianmcook commented on a change in pull request #10254:
URL: https://github.com/apache/arrow/pull/10254#discussion_r627465379



##########
File path: r/NEWS.md
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@@ -17,17 +17,21 @@
   under the License.
 -->
 
-# arrow 4.0.0.9000
+# arrow 4.0.0.9000 (under development)
 
-# arrow 3.0.0.9000
+# arrow 4.0.0.1
 
+ * The mimalloc memory allocator is the default memory allocator when using a static source build of the package on Linux. This is because it has better behavior under valgrind than jemalloc does. A full-featured build (installed with `LIBARROW_MINIMAL=false`) includes both jemalloc and mimalloc, and it has still has jemalloc as default, though this is configurable at runtime with the `ARROW_DEFAULT_MEMORY_POOL` environment variable.
+ * Environment variables `LIBARROW_MINIMAL`, `LIBARROW_DOWNLOAD`, and `NOT_CRAN` are now case-insensitive in the Linux build script.
+ * A build configuration issue in the macOS binary package has been resolved.
+# arrow 4.0.0

Review comment:
       Add line breaks
   ```suggestion
   
   # arrow 4.0.0
   
   ```




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