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https://issues.apache.org/jira/browse/HIVE-7659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096897#comment-14096897
 ] 

Hive QA commented on HIVE-7659:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12661682/HIVE-7659-spark.patch

{color:red}ERROR:{color} -1 due to 8 failed/errored test(s), 5844 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sample_islocalmode_hook
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynpart_sort_opt_vectorization
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testNegativeCliDriver_fs_default_name2
org.apache.hive.jdbc.miniHS2.TestHiveServer2.testConnection
org.apache.hive.minikdc.TestJdbcWithMiniKdc.testConnection
org.apache.hive.minikdc.TestJdbcWithMiniKdc.testNegativeTokenAuth
org.apache.hive.minikdc.TestJdbcWithMiniKdc.testProxyAuth
org.apache.hive.minikdc.TestJdbcWithMiniKdc.testTokenAuth
{noformat}

Test results: 
http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-SPARK-Build/41/testReport
Console output: 
http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-SPARK-Build/41/console
Test logs: 
http://ec2-54-176-176-199.us-west-1.compute.amazonaws.com/logs/PreCommit-HIVE-SPARK-Build-41/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 8 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12661682

> Unnecessary sort in query plan
> ------------------------------
>
>                 Key: HIVE-7659
>                 URL: https://issues.apache.org/jira/browse/HIVE-7659
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Rui Li
>         Attachments: HIVE-7659-spark.patch
>
>
> For hive on spark.
> Currently we rely on the sort order in RS to decide whether we need a 
> sortByKey transformation. However a simple group by query will also have the 
> sort order set to '+'.
> Consider the query: select key from table group by key. The RS in the map 
> work will have sort order set to '+', thus requiring a sortByKey shuffle.
> To avoid the unnecessary sort, we should either use another way to decide if 
> there has to be a sort shuffle, or we should set the sort order only when 
> sort is really needed.



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