From 9e2eb13ca59fc7ac66c6accd49469f339700b23b Mon Sep 17 00:00:00 2001 From: Ioana Delaney <ioanamdelaney@gmail.com> Date: Fri, 3 Jun 2016 12:04:27 -0700 Subject: [PATCH] [SPARK-15677][SQL] Query with scalar sub-query in the SELECT list throws UnsupportedOperationException ## What changes were proposed in this pull request? Queries with scalar sub-query in the SELECT list run against a local, in-memory relation throw UnsupportedOperationException exception. Problem repro: ```SQL scala> Seq((1, 1), (2, 2)).toDF("c1", "c2").createOrReplaceTempView("t1") scala> Seq((1, 1), (2, 2)).toDF("c1", "c2").createOrReplaceTempView("t2") scala> sql("select (select min(c1) from t2) from t1").show() java.lang.UnsupportedOperationException: Cannot evaluate expression: scalar-subquery#62 [] at org.apache.spark.sql.catalyst.expressions.Unevaluable$class.eval(Expression.scala:215) at org.apache.spark.sql.catalyst.expressions.ScalarSubquery.eval(subquery.scala:62) at org.apache.spark.sql.catalyst.expressions.Alias.eval(namedExpressions.scala:142) at org.apache.spark.sql.catalyst.expressions.InterpretedProjection.apply(Projection.scala:45) at org.apache.spark.sql.catalyst.expressions.InterpretedProjection.apply(Projection.scala:29) at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234) at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234) at scala.collection.immutable.List.foreach(List.scala:381) at scala.collection.TraversableLike$class.map(TraversableLike.scala:234) at scala.collection.immutable.List.map(List.scala:285) at org.apache.spark.sql.catalyst.optimizer.ConvertToLocalRelation$$anonfun$apply$37.applyOrElse(Optimizer.scala:1473) ``` The problem is specific to local, in memory relations. It is caused by rule ConvertToLocalRelation, which attempts to push down a scalar-subquery expression to the local tables. The solution prevents the rule to apply if Project references scalar subqueries. ## How was this patch tested? Added regression tests to SubquerySuite.scala Author: Ioana Delaney <ioanamdelaney@gmail.com> Closes #13418 from ioana-delaney/scalarSubV2. --- .../sql/catalyst/optimizer/Optimizer.scala | 7 ++++- .../org/apache/spark/sql/SubquerySuite.scala | 27 +++++++++++++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala index 11cd84b396..1e10d73a4b 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala @@ -1511,10 +1511,15 @@ object DecimalAggregates extends Rule[LogicalPlan] { */ object ConvertToLocalRelation extends Rule[LogicalPlan] { def apply(plan: LogicalPlan): LogicalPlan = plan transform { - case Project(projectList, LocalRelation(output, data)) => + case Project(projectList, LocalRelation(output, data)) + if !projectList.exists(hasUnevaluableExpr) => val projection = new InterpretedProjection(projectList, output) LocalRelation(projectList.map(_.toAttribute), data.map(projection)) } + + private def hasUnevaluableExpr(expr: Expression): Boolean = { + expr.find(e => e.isInstanceOf[Unevaluable] && !e.isInstanceOf[AttributeReference]).isDefined + } } /** diff --git a/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala index 4819692733..a932125f3c 100644 --- a/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala +++ b/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala @@ -123,6 +123,33 @@ class SubquerySuite extends QueryTest with SharedSQLContext { ) } + test("SPARK-15677: Queries against local relations with scalar subquery in Select list") { + withTempTable("t1", "t2") { + Seq((1, 1), (2, 2)).toDF("c1", "c2").createOrReplaceTempView("t1") + Seq((1, 1), (2, 2)).toDF("c1", "c2").createOrReplaceTempView("t2") + + checkAnswer( + sql("SELECT (select 1 as col) from t1"), + Row(1) :: Row(1) :: Nil) + + checkAnswer( + sql("SELECT (select max(c1) from t2) from t1"), + Row(2) :: Row(2) :: Nil) + + checkAnswer( + sql("SELECT 1 + (select 1 as col) from t1"), + Row(2) :: Row(2) :: Nil) + + checkAnswer( + sql("SELECT c1, (select max(c1) from t2) + c2 from t1"), + Row(1, 3) :: Row(2, 4) :: Nil) + + checkAnswer( + sql("SELECT c1, (select max(c1) from t2 where t1.c2 = t2.c2) from t1"), + Row(1, 1) :: Row(2, 2) :: Nil) + } + } + test("SPARK-14791: scalar subquery inside broadcast join") { val df = sql("select a, sum(b) as s from l group by a having a > (select avg(a) from l)") val expected = Row(3, 2.0, 3, 3.0) :: Row(6, null, 6, null) :: Nil -- GitLab