Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18159#discussion_r125212464
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -47,10 +56,56 @@ trait RunnableCommand extends logical.Command {
}
/**
+ * A trait for classes that can update its metrics of data writing
operation.
+ */
+trait MetricUpdater {
--- End diff --
I'd like to call it `trait InsertionCommand extends RunnableCommand`, as we
are updating `avgTime`, `numFiles` etc, which is specific to insertion.
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