Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/11190#discussion_r52810643
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/CatalystQlSuite.scala
---
@@ -201,4 +201,12 @@ class CatalystQlSuite extends PlanTest {
parser.parsePlan("select sum(product + 1) over (partition by (product
+ (1)) order by 2) " +
"from windowData")
}
+
+ test("subquery") {
+ parser.parsePlan("select (select max(b) from s) ss from t")
--- End diff --
The only thing we are testing here is that things don't go really really
wrong. I'd prefer it if we test the plan as well.
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