Nattavut Sutyanyong created SPARK-16804:
-------------------------------------------
Summary: Correlated subqueries containing LIMIT return incorrect
results
Key: SPARK-16804
URL: https://issues.apache.org/jira/browse/SPARK-16804
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.0
Reporter: Nattavut Sutyanyong
Correlated subqueries with LIMIT could return incorrect results. The rule
ResolveSubquery in the Analysis phase moves correlated predicates to a join
predicates and neglect the semantic of the LIMIT.
Example:
Seq(1, 2).toDF("c1").createOrReplaceTempView("t1")
Seq(1, 2).toDF("c2").createOrReplaceTempView("t2")
sql("select c1 from t1 where exists (select 1 from t2 where t1.c1=t2.c2 LIMIT
1)").show
+---+
| c1|
+---+
| 1|
+---+
The correct result contains both rows from T1.
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