Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/3173#discussion_r21134250
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
---
@@ -163,6 +177,37 @@ case class HashPartitioning(expressions:
Seq[Expression], numPartitions: Int)
}
/**
+ * Represents a partitioning where rows are split up across partitions
based on the hash
+ * of `expressions`. All rows where `expressions` evaluate to the same
values are guaranteed to be
+ * in the same partition. In each partition, the keys are sorted according
to expressions
--- End diff --
the keys are sorted => the rows are sorted?
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