Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/5247#issuecomment-94615111
Revert to my first commit version, reconstruct the Logicalplan of command
as LocalRelation in DataFrame since
1 IMO the logicalPlan of DF of command should be LocalRelation from syntax,
such that `isLocal` of the cmd's `DataFrame` can return true
(https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala#L298)
2 we can not transform from RunnableCommand to LocalTableScan in planner
directly since that will leads to cmd executed twice
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