Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/17810#discussion_r114066762
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/GeneratorFunctionSuite.scala ---
@@ -91,7 +91,7 @@ class GeneratorFunctionSuite extends QueryTest with
SharedSQLContext {
val df = Seq((1, Seq(1, 2, 3)), (2, Seq())).toDF("a", "intList")
checkAnswer(
df.select(explode_outer('intList)),
- Row(1) :: Row(2) :: Row(3) :: Nil)
+ Row(1) :: Row(2) :: Row(3) :: Row(null) :: Nil)
--- End diff --
So I think we should move away from that definition, and make `outer`
independent from `join`. The reason for this is that I think it is super
confusing that the following queries produce different results:
```
df.select($"k", outer_explode($"v"))
df.select(outer_explode($"v"))
```
If you do not want the outer semantic, then just use a regular generator.
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