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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3872) MAP JOIN for VIEW thorws NULL pointer exception error
Date Wed, 16 Jan 2013 11:54:15 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554962#comment-13554962
] 

Phabricator commented on HIVE-3872:
-----------------------------------

njain has accepted the revision "HIVE-3872 [jira] MAP JOIN  for VIEW thorws NULL pointer exception
error".

REVISION DETAIL
  https://reviews.facebook.net/D7965

BRANCH
  DPAL-1961

To: JIRA, njain, navis

                
> 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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