Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/20020#discussion_r158333591
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -87,6 +87,44 @@ case class ExecutedCommandExec(cmd: RunnableCommand)
extends LeafExecNode {
}
}
+/**
+ * A physical operator that executes the run method of a
`DataWritingCommand` and
+ * saves the result to prevent multiple executions.
+ *
+ * @param cmd the `DataWritingCommand` this operator will run.
+ * @param child the physical plan child ran by the `DataWritingCommand`.
+ */
+case class DataWritingCommandExec(cmd: DataWritingCommand, child:
SparkPlan)
+ extends SparkPlan {
+
+ override lazy val metrics: Map[String, SQLMetric] = cmd.metrics
+
+ protected[sql] lazy val sideEffectResult: Seq[InternalRow] = {
+ val converter =
CatalystTypeConverters.createToCatalystConverter(schema)
+ val rows = cmd.run(sqlContext.sparkSession, child)
+
+ rows.map(converter(_).asInstanceOf[InternalRow])
+ }
+
+ override def children: Seq[SparkPlan] = child :: Nil
+
+ override def innerChildren: Seq[QueryPlan[_]] = cmd :: Nil
--- End diff --
I was following `ExecutedCommandExec`. And I can see some slight difference
with`explain` command. I can remove it.
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