Github user scwf commented on a diff in the pull request:
https://github.com/apache/spark/pull/3935#discussion_r22636181
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala ---
@@ -326,4 +327,17 @@ private[sql] abstract class SparkStrategies extends
QueryPlanner[SparkPlan] {
case _ => Nil
}
}
+
+ case class DDLStrategy(context: SQLContext) extends Strategy {
+ def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {
+ case describe: logical.DescribeCommand =>
+ val resolvedTable = context.executePlan(describe.table).analyzed
+ resolvedTable match {
+ case LogicalRelation(relation) =>
+ Seq(ExecutedCommand(DDLDescribeCommand(relation,
describe.output, describe.isExtended)))
+ case o: logical.DescribeCommand =>
+ ExecutedCommand(DescribeCommand(planLater(o),
describe.output)) :: Nil
--- End diff --
Maybe we do not need this strategy. In ddl.scala we parse a runnable
```DDLDescribeCommand``` not logical.DescribeCommand, then it will follow
commandstrategy
```
case object CommandStrategy extends Strategy {
def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {
case r: RunnableCommand => ExecutedCommand(r) :: Nil
```
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