Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17935#discussion_r116153501
--- 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 --
I'm surprised we support this syntax, I think the FROM clause must have an
alias.
I checked with postgres, it will throw exception `subquery in FROM must
have an alias`, can you check with other databases? Thanks!
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