nealrichardson commented on a change in pull request #9561:
URL: https://github.com/apache/arrow/pull/9561#discussion_r585980464
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File path: r/R/dataset-write.R
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@@ -41,6 +41,9 @@
#' will yield `"part-0.feather", ...`.
#' @param hive_style logical: write partition segments as Hive-style
#' (`key1=value1/key2=value2/file.ext`) or as just bare values. Default is
`TRUE`.
+#' @param hive_null_fallback If writing partition segments as Hive-style
+#' directories then this value will be used in place of any null value in a
+#' partition column.
Review comment:
```suggestion
```
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