Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4496#discussion_r24398240
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -116,6 +116,9 @@ trait DataFrame extends RDDApi[Row] {
/** Prints the schema to the console in a nice tree format. */
def printSchema(): Unit
+ /** Returns the plan information as string array for debugging purpose.
*/
+ def explain(extended: Boolean): Array[String]
--- End diff --
it seems to me it'd make more sense for explain to just print something to
the console by default, isn't it?
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