Github user tedyu commented on the pull request:
https://github.com/apache/spark/pull/10368#issuecomment-167018650
Here was why I implemented equals for Map (from #48257):
{code}
[info] - Bug: SPARK-12415 *** FAILED *** (3 milliseconds)
[info] java.nio.HeapByteBuffer[pos=0 lim=2 cap=2] null
org.apache.spark.executor.TaskMetrics@60d6ae17 did not equal
java.nio.HeapByteBuffer[pos=0 lim=2 cap=2] Map()
org.apache.spark.executor.TaskMetrics@2122833f Deser
java.nio.HeapByteBuffer[pos=0 lim=2 cap=2] null
org.apache.spark.executor.TaskMetrics@60d6ae17 orig
java.nio.HeapByteBuffer[pos=0 lim=2 cap=2] Map()
org.apache.spark.executor.TaskMetrics@2122833f (KryoSerializerSuite.scala:163)
{code}
One Map was null and one Map was empty.
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