Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19870#discussion_r154542257
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -838,6 +838,8 @@ case class RepartitionByExpression(
numPartitions: Int) extends RepartitionOperation {
require(numPartitions > 0, s"Number of partitions ($numPartitions) must
be positive.")
+ require(partitionExpressions.nonEmpty, s"${getClass.getSimpleName}
requires a non empty set of " +
+ s"partitioning expressions.")
--- End diff --
Let's remove this leading 's'.
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