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Posted to dev@hive.apache.org by "Chao (JIRA)" <ji...@apache.org> on 2014/12/16 00:00:14 UTC

[jira] [Created] (HIVE-9112) Query may generate different results depending on the number of reducers

Chao created HIVE-9112:
--------------------------

             Summary: Query may generate different results depending on the number of reducers
                 Key: HIVE-9112
                 URL: https://issues.apache.org/jira/browse/HIVE-9112
             Project: Hive
          Issue Type: Bug
            Reporter: Chao


Some queries may generate different results depending on the number of reducers, for example, tests like ppd_multi_insert.q, join_nullsafe.q, subquery_in.q, etc.

Take subquery_in.q as example, if we add
{noformat}
set mapred.reduce.tasks=3;
{noformat}

to this test file, the result will be different (and wrong):

{noformat}
@@ -903,5 +903,3 @@ where li.l_linenumber = 1 and
 POSTHOOK: type: QUERY
 POSTHOOK: Input: default@lineitem
 #### A masked pattern was here ####
-108570 8571
-4297   1798
{noformat}





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