jonkeane commented on a change in pull request #11552:
URL: https://github.com/apache/arrow/pull/11552#discussion_r737463823
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File path: r/R/dataset-write.R
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@@ -38,6 +38,14 @@
#' 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 existing_data_behavior The behavior to use when there is already data
+#' in the destination directory. Must be one of overwrite, error, or
+#' delete_matching. When this is set to "overwrite" (the default) then any
+#' new files created will overwrite existing files. When this is set to
+#' "error" then the operation will fail if the destination directory is not
+#' empty. When this is set to "delete_matching" then the writer will delete
+#' any existing partitions if data is going to be written to those partitions
+#' and will leave alone partitions which data is not written to.
Review comment:
```suggestion
#' @param existing_data_behavior The behavior to use when there is already
data
#' in the destination directory. Must be one of "overwrite", "error", or
#' "delete_matching".
#' - "overwrite" (the default) then any new files created will overwrite
#' existing files
#' - "error" then the operation will fail if the destination directory is not
#' empty
#' - "delete_matching" then the writer will delete any existing partitions
#' if data is going to be written to those partitions and will leave alone
#' partitions which data is not written to.
```
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