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https://issues.apache.org/jira/browse/HIVE-19388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466494#comment-16466494
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Vihang Karajgaonkar commented on HIVE-19388:
--------------------------------------------
Thanks for the review [~lirui]. Patch merged to branch-2 and master
> ClassCastException during VectorMapJoinCommonOperator initialization
> --------------------------------------------------------------------
>
> Key: HIVE-19388
> URL: https://issues.apache.org/jira/browse/HIVE-19388
> Project: Hive
> Issue Type: Bug
> Affects Versions: 2.1.1, 2.2.0, 3.0.0, 2.3.2, 3.1.0
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Priority: Major
> Fix For: 2.4.0, 3.1.0
>
> Attachments: HIVE-19388.01.patch, HIVE-19388.02.patch
>
>
> I see the following exceptions when I a mapjoin operator is being initialized
> on Hive-on-Spark and when vectorization is turned on.
> This happens when the hashTable is empty. The code in
> {{MapJoinTableContainerSerDe#getDefaultEmptyContainer}} method returns a
> HashMapWrapper while the VectorMapJoinOperator expects a
> {{MapJoinBytesTableContainer}} when {{hive.mapjoin.optimized.hashtable}} is
> set to true.
> {noformat}
> Caused by: java.lang.ClassCastException:
> org.apache.hadoop.hive.ql.exec.persistence.HashMapWrapper cannot be cast to
> org.apache.hadoop.hive.ql.exec.persistence.MapJoinTableContainerDirectAccess
> at
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedHashTable.<init>(VectorMapJoinOptimizedHashTable.java:92)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedHashMap.<init>(VectorMapJoinOptimizedHashMap.java:127)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedStringHashMap.<init>(VectorMapJoinOptimizedStringHashMap.java:60)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedCreateHashTable.createHashTable(VectorMapJoinOptimizedCreateHashTable.java:80)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinCommonOperator.setUpHashTable(VectorMapJoinCommonOperator.java:485)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinCommonOperator.completeInitializationOp(VectorMapJoinCommonOperator.java:461)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.Operator.completeInitialization(Operator.java:471)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:401)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:574)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:526)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:387)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.spark.SparkMapRecordHandler.init(SparkMapRecordHandler.java:109)
> ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
> ... 16 more
> {noformat}
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