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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