Nattavut Sutyanyong created SPARK-17348:
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Summary: Incorrect results from subquery transformation
Key: SPARK-17348
URL: https://issues.apache.org/jira/browse/SPARK-17348
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.0
Reporter: Nattavut Sutyanyong
{noformat}
Seq((1,1)).toDF("c1","c2").createOrReplaceTempView("t1")
Seq((1,1),(2,0)).toDF("c1","c2").createOrReplaceTempView("t2")
sql("select c1 from t1 where c1 in (select max(t2.c1) from t2 where t1.c2 >=
t2.c2)").show
+---+
| c1|
+---+
| 1|
+---+
{noformat}
The correct result of the above query should be an empty set. Here is an
explanation:
Both rows from T2 satisfies the correlated predicate T1.C2 >= T2.C2 when T1.C1
= 1 so both rows needs to be processed in the same group of the aggregation
process in the subquery. The result of the aggregation yields MAX(T2.C1) as 2.
Therefore, the result of the evaluation of the predicate T1.C1 (which is 1) IN
MAX(T2.C1) (which is 2) should be an empty set.
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