Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11190#discussion_r52824062
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -2105,6 +2105,18 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
assert(error.getMessage contains "grouping_id() can only be used with
GroupingSets/Cube/Rollup")
}
+ test("uncorrelated scalar subquery") {
+ assertResult(Array(Row(1))) {
+ sql("select (select 1 as b) as b").collect()
+ }
+
+ assertResult(Array(Row(1))) {
+ sql("with t2 as (select 1 as b, 2 as c) " +
+ "select a from (select 1 as a union all select 2 as a) t " +
+ "where a = (select max(b) from t2) ").collect()
--- End diff --
Added
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