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https://issues.apache.org/jira/browse/HIVE-3872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554959#comment-13554959
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Namit Jain commented on HIVE-3872:
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+1
> MAP JOIN for VIEW thorws NULL pointer exception error
> ------------------------------------------------------
>
> Key: HIVE-3872
> URL: https://issues.apache.org/jira/browse/HIVE-3872
> Project: Hive
> Issue Type: Bug
> Components: Views
> Reporter: Santosh Achhra
> Assignee: Navis
> Priority: Critical
> Labels: HINTS, MAPJOIN
> Attachments: HIVE-3872.D7965.1.patch
>
>
> I have created a view as shown below.
> CREATE VIEW V1 AS
> select /*+ MAPJOIN(t1) ,MAPJOIN(t2) */ t1.f1, t1.f2, t1.f3, t1.f4, t2.f1,
> t2.f2, t2.f3 from TABLE1 t1 join TABLE t2 on ( t1.f2= t2.f2 and t1.f3 = t2.f3
> and t1.f4 = t2.f4 ) group by t1.f1, t1.f2, t1.f3, t1.f4, t2.f1, t2.f2, t2.f3
> View get created successfully however when I execute below mentioned SQL or
> any SQL on the view get NULLPOINTER exception error
> hive> select count (*) from V1;
> FAILED: NullPointerException null
> hive>
> Is there anything wrong with the view creation ?
> Next I created view without MAPJOIN hints
> CREATE VIEW V1 AS
> select t1.f1, t1.f2, t1.f3, t1.f4, t2.f1, t2.f2, t2.f3 from TABLE1 t1 join
> TABLE t2 on ( t1.f2= t2.f2 and t1.f3 = t2.f3 and t1.f4 = t2.f4 ) group by
> t1.f1, t1.f2, t1.f3, t1.f4, t2.f1, t2.f2, t2.f3
> Before executing select SQL I excute set hive.auto.convert.join=true;
> I am getting beloow mentioned warnings
> java.lang.InstantiationException:
> org.apache.hadoop.hive.ql.parse.ASTNodeOrigin
> Continuing ...
> java.lang.RuntimeException: failed to evaluate: <unbound>=Class.new();
> Continuing ...
> And I see from log that total 5 mapreduce jobs are started however when don't
> set auto.convert.join to true, I see only 3 mapreduce jobs getting invoked.
> Total MapReduce jobs = 5
> Ended Job = 1116112419, job is filtered out (removed at runtime).
> Ended Job = -33256989, job is filtered out (removed at runtime).
> WARNING: org.apache.hadoop.metrics.jvm.EventCounter is deprecated. Please use
> org.apache.hadoop.log.metrics.EventCounter in all the log4j.properties files.
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