Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9364#discussion_r43558527
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/partitioning.scala
---
@@ -31,10 +31,11 @@ case class SortPartitions(sortExpressions:
Seq[SortOrder], child: LogicalPlan)
extends RedistributeData
/**
- * This method repartitions data using [[Expression]]s, and receives
information about the
- * number of partitions during execution. Used when a specific ordering or
distribution is
- * expected by the consumer of the query result. Use [[Repartition]] for
RDD-like
+ * This method repartitions data using [[Expression]]s into
`numPartitions`, and receives
+ * information about the number of partitions during execution. Used when
a specific ordering or
+ * distribution is expected by the consumer of the query result. Use
[[Repartition]] for RDD-like
* `coalesce` and `repartition`.
+ * If `numPartitions` is not specified, the partition in `child` is
preserved.
--- End diff --
the partition in `child` is preserved. => the number of partitions of the
`child` is preserved?
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