Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12936#discussion_r62792794
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/metric/SQLMetrics.scala 
---
    @@ -29,9 +29,18 @@ class SQLMetric(val metricType: String, initValue: Long 
= 0L) extends Accumulato
       // We may use -1 as initial value of the accumulator, if the accumulator 
is valid, we will
       // update it at the end of task and the value will be at least 0. Then 
we can filter out the -1
       // values before calculate max, min, etc.
    -  private[this] var _value = initValue
    +  private var _value = initValue
    --- End diff --
    
    `initValue` will be assigned to `_value` when creating accumulator, and 
`zeroValue` will be assigned to `_value` when calling `reset`, how about it?
    
    Most of the time `initValue` is equal to `zeroValue`,  it's only used in 
`copy`.


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