Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18159
After think about it more, I think the problem we need to solve here is to
support metrics for `RunnableCommand`. My previous refactor fixed the problem
to support children in `RunnableCommand`.
My proposal:
```
trait RunnableCommand {
val metrics: Map[String, SQLMetric] = Map.empty
...
}
case class ExecutedCommandExec(
cmd: RunnableCommand,
children: Seq[SparkPlan],
override val metrics: Map[String, SQLMetric])
```
In `InsertIntoHadoopFsRelationCommand` we can override the `metrics` and
update it according to `FileFormatWritter`. And in the planner we pass
`RunnableCommand.metrics` to `ExecutedCommandExec`
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