nealrichardson commented on a change in pull request #10992:
URL: https://github.com/apache/arrow/pull/10992#discussion_r701841957



##########
File path: r/NEWS.md
##########
@@ -19,6 +19,11 @@
 
 # arrow 5.0.0.9000
 
+## Breaking changes
+
+* `dplyr::summarize()` on an in-memory Arrow Table or RecordBatch no longer 
eagerly evaluates. Call `compute()` or `collect()` to evaluate the query.
+* Row order of data from a Dataset query is no longer deterministic. If you 
need a stable sort order, you should explicitly `arrange()` the query.

Review comment:
       Yeah of course, we should fill in NEWS, I was just noting these breaking 
changes so that I didn't forget. 




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