Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/23025#discussion_r237174135
--- Diff: R/pkg/R/DataFrame.R ---
@@ -767,6 +767,14 @@ setMethod("repartition",
#' using \code{spark.sql.shuffle.partitions} as
number of partitions.}
#'}
#'
+#' At least one partition-by expression must be specified.
--- End diff --
@felixcheung have a look at https://github.com/apache/spark/pull/23167
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