Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
    @@ -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: 
    --- End diff --
    Could you add the parm description of `coalescer`? also update function 
descriptions? Thanks~!

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