Github user nsyca commented on a diff in the pull request:
https://github.com/apache/spark/pull/16467#discussion_r94519375
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala
---
@@ -263,12 +263,12 @@ class SubquerySuite extends QueryTest with
SharedSQLContext {
Row(1, 2.0) :: Row(1, 2.0) :: Nil)
checkAnswer(
- sql("select * from l where a not in (select c from t where b < d)"),
- Row(1, 2.0) :: Row(1, 2.0) :: Row(3, 3.0) :: Nil)
+ sql("select * from l where (a, b) not in (select c, d from t) and a
< 4"),
+ Row(1, 2.0) :: Row(1, 2.0) :: Row(2, 1.0) :: Row(2, 1.0) :: Row(3,
3.0) :: Nil)
// Empty sub-query
checkAnswer(
- sql("select * from l where a not in (select c from r where c > 10
and b < d)"),
+ sql("select * from l where (a, b) not in (select c, d from r where c
> 10)"),
--- End diff --
With the predicate `c > 10` (which filters all the rows in the subquery),
it covers up the correlated predicate problem. Instead of removing the test
case completely, I just modify to have a different coverage for multiple
columns.
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