Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18861#discussion_r131570472
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala
---
@@ -571,7 +570,8 @@ case class UnionExec(children: Seq[SparkPlan]) extends
SparkPlan {
* current upstream partitions will be executed in parallel (per whatever
* the current partitioning is).
*/
-case class CoalesceExec(numPartitions: Int, child: SparkPlan) extends
UnaryExecNode {
+case class CoalesceExec(numPartitions: Int, child: SparkPlan, coalescer:
Option[PartitionCoalescer])
--- End diff --
Could you add the parm description of `coalescer`? also update function
descriptions? Thanks~!
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