srowen commented on issue #23986: [SPARK-27070] Fix performance bug in DefaultPartitionCoalescer URL: https://github.com/apache/spark/pull/23986#issuecomment-473578962 @fitermay I guess it has to be more explicitly constructed as an `Ordering`? ``` [error] /home/jenkins/workspace/spark-master-test-maven-hadoop-2.7-ubuntu-scala-2.11/core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala:161: type mismatch; [error] found : (org.apache.spark.rdd.PartitionGroup, org.apache.spark.rdd.PartitionGroup) => Int [error] required: Ordering[org.apache.spark.rdd.PartitionGroup] [error] (o1: PartitionGroup, o2: PartitionGroup) => [error] ^ [info] (org.apache.spark.rdd.PartitionGroup, org.apache.spark.rdd.PartitionGroup) => Int <: Ordering[org.apache.spark.rdd.PartitionGroup]? [info] false [error] one error found [error] Compile failed at Mar 14, 2019 6:17:42 PM [22.876s] ```
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