[jira] [Assigned] (SPARK-15692) Improves the explain output of several physical plans by displaying embedded logical plan in tree style

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-15692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-15692:
------------------------------------

    Assignee:     (was: Apache Spark)

> Improves the explain output of several physical plans by displaying embedded logical plan in tree style
> -------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-15692
>                 URL: https://issues.apache.org/jira/browse/SPARK-15692
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Sean Zhong
>            Priority: Minor
>
> Some physical plan contains a embedded logical plan, for example, {code}cache tableName query{code} maps to:
> {code}
> case class CacheTableCommand(
>     tableName: String,
>     plan: Option[LogicalPlan],
>     isLazy: Boolean) 
>   extends RunnableCommand
> {code}
> It is easier to read the explain output if we can display the `plan` in tree style.
> Before change:
> {code}
> scala> Seq((1,2)).toDF().createOrReplaceTempView("testView")
> scala> spark.sql("cache table testView2 select * from testView").explain()
> == Physical Plan ==
> ExecutedCommand CacheTableCommand testView2, Some('Project [*]
> +- 'UnresolvedRelation `testView`, None
> ), false
> {code}
> After change:
> {code}
> scala> spark.sql("cache table testView2 select * from testView").explain()
> == Physical Plan ==
> ExecutedCommand
> :  +- CacheTableCommand testView2, false
> :     :  +- 'Project [*]
> :     :     +- 'UnresolvedRelation `testView`, None
> {code}



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