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https://issues.apache.org/jira/browse/HIVE-1678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amareshwari Sriramadasu updated HIVE-1678:
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Attachment: patch-1678.txt
The bug is in plan generation when MapJoin is followed MapJoin, and is followed
by ReduceSink. ReduceSink operator reads the input from oldMapJoin instead of
current MapJoin.
Attached patch has one line fix in GenMapRedUtils.initMapJoinPlan to fix the
bug. Also includes the testcase.
> NPE in MapJoin
> ---------------
>
> Key: HIVE-1678
> URL: https://issues.apache.org/jira/browse/HIVE-1678
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Amareshwari Sriramadasu
> Assignee: Amareshwari Sriramadasu
> Attachments: patch-1678.txt
>
>
> The query with two map joins and a group by fails with following NPE:
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.exec.MapJoinOperator.processOp(MapJoinOperator.java:177)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:697)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:84)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:697)
> at
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:464)
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