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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