Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/5383#discussion_r28310315 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/Generate.scala --- @@ -21,6 +21,15 @@ import org.apache.spark.annotation.DeveloperApi import org.apache.spark.rdd.RDD import org.apache.spark.sql.catalyst.expressions._ +// for lazy computing, be sure the generator.terminate() called in the very last +private[execution] sealed case class LazyIterator(func: () => TraversableOnce[Row]) + extends Iterator[Row] { + + lazy val results = func().toIterator + override def hasNext: Boolean = results.hasNext + override def next(): Row = results.next() +} --- End diff -- This can be removed since `CompletionIterator` should be enough.
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