jonkeane commented on a change in pull request #9561:
URL: https://github.com/apache/arrow/pull/9561#discussion_r582267627
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File path: r/R/dataset-partition.R
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@@ -25,12 +25,17 @@
#' `DirectoryPartitioning` describes how to interpret raw path segments, in
#' order. For example, `schema(year = int16(), month = int8())` would define
#' partitions for file paths like "2019/01/file.parquet",
-#' "2019/02/file.parquet", etc.
+#' "2019/02/file.parquet", etc. In this scheme null values will be skipped.
+#' In the previous example, if the month was null, the files would be placed
+#' in 2019/file.parquet. An error will be raised if an outer directory is
Review comment:
Error will be raised sounds fine to me.
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