Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/15489#discussion_r83500257
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -1106,6 +1106,30 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
)
}
+ test("SPARK-17863: SELECT distinct does not work correctly if order by
missing attribute") {
+ checkAnswer(
+ sql("""select distinct struct.a, struct.b
+ |from (
+ | select named_struct('a', 1, 'b', 2, 'c', 3) as struct
+ | union all
+ | select named_struct('a', 1, 'b', 2, 'c', 4) as struct) tmp
+ |order by a, b
+ |""".stripMargin),
+ Row(1, 2) :: Nil)
+
+ val error = intercept[AnalysisException] {
+ sql("""select distinct struct.a, struct.b
+ |from (
+ | select named_struct('a', 1, 'b', 2, 'c', 3) as struct
+ | union all
+ | select named_struct('a', 1, 'b', 2, 'c', 4) as struct) tmp
+ |order by struct.a, struct.b
+ |""".stripMargin)
+ }
+ assert(error.message contains "cannot resolve '`struct.a`' given input
columns: [a, b]")
--- End diff --
Oh, i see. Seems this error is thrown by check analysis, which does not
have info about what is the query. So, it is hard to figure out what messages
(for the workaround) to put at here.
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