cloud-fan commented on a change in pull request #27941: [SPARK-31178][SQL]
Prevent V2 exec nodes from executing multiple times
URL: https://github.com/apache/spark/pull/27941#discussion_r394082821
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/WriteToDataSourceV2Exec.scala
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@@ -347,10 +347,26 @@ trait BatchWriteHelper {
}
}
+/**
+ * A base trait for executing a write eagerly and caching the result, similar
to
+ * `ExecutedCommandExec`, so that a write is executed only once.
+ */
+trait V2TableWriteExecBase extends SparkPlan {
Review comment:
can we reuse `V2CommandExec`? The major difference is the return type of
`run`, but I don't think there is a command that must return an RDD.
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