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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