Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/20284
It is actually. Before, negative values (empty metrics all have value "-1")
would show up when starting iteration from 0, and now they don't.
```
store.view(classOf[TaskDataWrapper])
.parent(stageKey)
.index(TaskIndexNames.EXEC_RUN_TIME)
.first(0L)
.closeableIterator()
```
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