Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/13065#discussion_r88524027 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/GenerateExec.scala --- @@ -40,6 +42,10 @@ private[execution] sealed case class LazyIterator(func: () => TraversableOnce[In * output of each into a new stream of rows. This operation is similar to a `flatMap` in functional * programming with one important additional feature, which allows the input rows to be joined with * their output. + * + * This operator supports whole stage code generation for generators that do not implement + * terminate(). --- End diff -- Could be done in ``` override def supportCodegen(): Boolean = { generator.terminate().isEmpty } ````
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