Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/18559#discussion_r126072760
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -2638,4 +2638,17 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
}
}
}
+
+ test("SPARK-21335: support un-aliased subquery") {
+ withTempView("v") {
+ Seq(1 -> "a").toDF("i", "j").createOrReplaceTempView("v")
+ checkAnswer(sql("SELECT i from (SELECT i FROM v)"), Row(1))
+
+ val e = intercept[AnalysisException](sql("SELECT v.i from (SELECT i
FROM v)"))
+ assert(e.message ==
+ "cannot resolve '`v.i`' given input columns:
[_auto_generated_subquery_name.i]")
--- End diff --
It's supported since 2.0.X, so definitely there are existing user queires
and apps. I'm agreeing with this PR and want to understand the scope of
changes. It looks good to me.
```scala
scala> sc.version
res0: String = 2.0.2
scala> Seq(1 -> "a").toDF("i", "j").createOrReplaceTempView("v")
scala> sql("SELECT v.i from (SELECT i FROM v)").show
+---+
| i|
+---+
| 1|
+---+
```
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