Github user techaddict commented on a diff in the pull request:
https://github.com/apache/spark/pull/12936#discussion_r62793263
--- 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 --
Something like this ?
```
private[this] var _value = initValue
private var _zeroValue = initValue
override def copy(): SQLMetric = {
val newAcc = new SQLMetric(metricType, _value)
newAcc._zeroValue = initValue
newAcc
}
override def reset(): Unit = _value = _zeroValue
```
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