dongjoon-hyun commented on a change in pull request #27803: [SPARK-31049][SQL]
Support nested adjacent generators, e.g., explode(explode(v))
URL: https://github.com/apache/spark/pull/27803#discussion_r399906896
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/GeneratorFunctionSuite.scala
##########
@@ -344,12 +345,55 @@ class GeneratorFunctionSuite extends QueryTest with
SharedSparkSession {
}
}
+ test("Supported nested inner generators") {
+ // Project cases
+ checkAnswer(
+ sql("SELECT explode(explode(array(array(1, 2), array(3))))"),
+ Row(1) :: Row(2) :: Row(3) :: Nil)
+ checkAnswer(
+ sql("SELECT array(array(4), array(5))
v").select(explode_outer(explode_outer($"v"))),
+ Row(4) :: Row(5) :: Nil)
+ checkAnswer(
+ sql("SELECT posexplode(explode(array(array(1, 2), array(3))))"),
+ Row(0, 1) :: Row(1, 2) :: Row(0, 3) :: Nil)
+ checkAnswer(
+ sql("SELECT array(array(4), array(5))
v").select(posexplode_outer(explode($"v"))),
+ Row(0, 4) :: Row(0, 5) :: Nil)
+ checkAnswer(
+ sql("SELECT inline(explode(array(array(struct(1, 'a'), struct(2,
'b')))))"),
+ Row(1, "a") :: Row(2, "b") :: Nil)
+
+ // Aggregate cases
+ checkAnswer(
+ sql("SELECT explode_outer(explode(array(array(min(v), max(v))))) FROM
VALUES 1, 2, 3 t(v)"),
+ Row(1) :: Row(3) :: Nil)
+ checkAnswer(
+ sql("SELECT array(array(min(v), max(v))) ar FROM VALUES 7, 9 t(v)")
+ .select(explode(explode_outer($"ar"))),
+ Row(7) :: Row(9) :: Nil)
Review comment:
Can we add more deep test case like the following?
```scala
scala> sql("select
explode(explode(explode(explode(array(array(array(array(1, 2), array(3,
4))))))))").show()
+---+
|col|
+---+
| 1|
| 2|
| 3|
| 4|
+---+
```
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