Sean Zhong created SPARK-15692:
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Summary: 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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