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  1. Hive
  2. HIVE-3872

MAP JOIN for VIEW throws NULL pointer exception error

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.11.0
    • Component/s: Views
    • Labels:
    • Hadoop Flags:
      Reviewed

      Description

      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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            • Assignee:
              navis Navis
              Reporter:
              santoshachhra Santosh Achhra
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              • Created:
                Updated:
                Resolved: