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[SPARK-18009][SQL] Fix ClassCastException while calling toLocalIterator() on dataframe produced by RunnableCommand #15642

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[SPARK-18009][SQL] Fix ClassCastException while calling toLocalIterator() on dataframe produced by RunnableCommand #15642

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2 changes: 2 additions & 0 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,8 @@ case class ExecutedCommandExec(cmd: RunnableCommand) extends SparkPlan {

override def executeCollect(): Array[InternalRow] = sideEffectResult.toArray

override def executeToIterator: Iterator[InternalRow] = sideEffectResult.toIterator

override def executeTake(limit: Int): Array[InternalRow] = sideEffectResult.take(limit).toArray

protected override def doExecute(): RDD[InternalRow] = {
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7 changes: 7 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/execution/command/DDLSuite.scala
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Expand Up @@ -1763,4 +1763,11 @@ class DDLSuite extends QueryTest with SharedSQLContext with BeforeAndAfterEach {
}
}
}

test("SPARK-18009 calling toLocalIterator on commands") {
import scala.collection.JavaConverters._
val df = sql("show databases")
val rows: Seq[Row] = df.toLocalIterator().asScala.toSeq
assert(rows.length > 0)
}
}