Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17935#discussion_r116165751
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala
---
@@ -868,6 +868,29 @@ class SubquerySuite extends QueryTest with
SharedSQLContext {
Row(3, 3.0, 2, 3.0) :: Row(3, 3.0, 2, 3.0) :: Nil)
}
+ test("SPARK-20690: Do not add missing attributes through subqueries") {
+ withTempView("onerow") {
+ Seq(1).toDF("c1").createOrReplaceTempView("onerow")
+
+ val e = intercept[AnalysisException] {
+ sql(
+ """
+ | select 1
+ | from (select 1 from onerow t1 LIMIT 1)
--- End diff --
https://docs.oracle.com/cd/E17952_01/mysql-5.1-en/from-clause-subqueries.html
> The [AS] name clause is mandatory, because every table in a FROM clause
must have a name. Any columns in the subquery select list must have unique
names.
Oracle also requires it.
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