Jacek Laskowski created SPARK-23731:
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Summary: FileSourceScanExec throws NullPointerException in
subexpression elimination
Key: SPARK-23731
URL: https://issues.apache.org/jira/browse/SPARK-23731
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.3.0, 2.2.1, 2.3.1
Reporter: Jacek Laskowski
While working with a SQL with many {{CASE WHEN}} and {{ScalarSubqueries}} I
faced the following exception (in Spark 2.3.0):
{code:java}
Caused by: java.lang.NullPointerException
at
org.apache.spark.sql.execution.FileSourceScanExec.<init>(DataSourceScanExec.scala:167)
at
org.apache.spark.sql.execution.FileSourceScanExec.doCanonicalize(DataSourceScanExec.scala:502)
at
org.apache.spark.sql.execution.FileSourceScanExec.doCanonicalize(DataSourceScanExec.scala:158)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:210)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:209)
at
org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$2.apply(QueryPlan.scala:224)
at
org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$2.apply(QueryPlan.scala:224)
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.plans.QueryPlan.doCanonicalize(QueryPlan.scala:224)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:210)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:209)
at
org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$2.apply(QueryPlan.scala:224)
at
org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$2.apply(QueryPlan.scala:224)
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.plans.QueryPlan.doCanonicalize(QueryPlan.scala:224)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:210)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:209)
at
org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$2.apply(QueryPlan.scala:224)
at
org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$2.apply(QueryPlan.scala:224)
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.plans.QueryPlan.doCanonicalize(QueryPlan.scala:224)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:210)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:209)
at
org.apache.spark.sql.catalyst.plans.QueryPlan.sameResult(QueryPlan.scala:257)
at
org.apache.spark.sql.execution.ScalarSubquery.semanticEquals(subquery.scala:58)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$Expr.equals(EquivalentExpressions.scala:36)
at scala.collection.mutable.HashTable$class.elemEquals(HashTable.scala:358)
at scala.collection.mutable.HashMap.elemEquals(HashMap.scala:40)
at
scala.collection.mutable.HashTable$class.scala$collection$mutable$HashTable$$findEntry0(HashTable.scala:136)
at scala.collection.mutable.HashTable$class.findEntry(HashTable.scala:132)
at scala.collection.mutable.HashMap.findEntry(HashMap.scala:40)
at scala.collection.mutable.HashMap.get(HashMap.scala:70)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExpr(EquivalentExpressions.scala:54)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:95)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$$anonfun$addExprTree$1.apply(EquivalentExpressions.scala:96)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:96)
at
org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext$$anonfun$subexpressionElimination$1.apply(CodeGenerator.scala:1168)
at
org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext$$anonfun$subexpressionElimination$1.apply(CodeGenerator.scala:1168)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.subexpressionElimination(CodeGenerator.scala:1168)
at
org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.generateExpressions(CodeGenerator.scala:1218)
at
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection$.createCode(GenerateUnsafeProjection.scala:310)
at
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection$.create(GenerateUnsafeProjection.scala:373)
at
org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection$.generate(GenerateUnsafeProjection.scala:362)
at
org.apache.spark.sql.catalyst.expressions.UnsafeProjection$.create(Projection.scala:161)
at
org.apache.spark.sql.execution.ProjectExec$$anonfun$9.apply(basicPhysicalOperators.scala:71)
at
org.apache.spark.sql.execution.ProjectExec$$anonfun$9.apply(basicPhysicalOperators.scala:70)
at
org.apache.spark.rdd.RDD$$anonfun$mapPartitionsWithIndexInternal$1$$anonfun$apply$24.apply(RDD.scala:818)
at
org.apache.spark.rdd.RDD$$anonfun$mapPartitionsWithIndexInternal$1$$anonfun$apply$24.apply(RDD.scala:818)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
at org.apache.spark.scheduler.Task.run(Task.scala:109)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:345)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748){code}
I've got the query and the parquet files that lead to the NPE, but cannot
disclose it due to NDA. I've been trying to replicate it with different
queries, but failed, and after over 3 days of exploring subexpression
elimination I gave up.
The NPE technically is due to [@transient relation:
HadoopFsRelation|https://github.com/apache/spark/blob/branch-2.3/sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala?utf8=%E2%9C%93#L159]
that is not re-created on executors, but don't know why this {{@transient}} is
required in the first place and more importantly how to write a test to
reproduce it.
FYI Disabling subexpression elimination with
{{spark.sql.subexpressionElimination.enabled}} Spark internal configuration
property helps.
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