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https://issues.apache.org/jira/browse/HIVE-9382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280714#comment-14280714
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Gopal V commented on HIVE-9382:
-------------------------------
+1 LGTM.
> Query got rerun with Global Limit optimization on and Fetch optimization off
> ----------------------------------------------------------------------------
>
> Key: HIVE-9382
> URL: https://issues.apache.org/jira/browse/HIVE-9382
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Affects Versions: 0.14.0
> Reporter: Wei Zheng
> Assignee: Wei Zheng
> Attachments: HIVE-9382.1.patch
>
>
> When Global Limit optimization is enabled, and Fetch Optimization for Simple
> Queries is off or not applicable, some queries with LIMIT clause will run
> twice.
> set hive.limit.optimize.enable=true;
> set hive.fetch.task.conversion=none;
> For example,
> {code:sql}
> hive> select * from t1 limit 10;
> Query ID = wzheng_20150107185252_4a6d0e65-9e58-464b-9ed3-9177740c30a9
> Total jobs = 1
> Launching Job 1 out of 1
> Status: Running (Executing on YARN cluster with App id
> application_1420567249453_0039)
> --------------------------------------------------------------------------------
> VERTICES STATUS TOTAL COMPLETED RUNNING PENDING FAILED
> KILLED
> --------------------------------------------------------------------------------
> Map 1 .......... SUCCEEDED 1 1 0 0 0
> 0
> --------------------------------------------------------------------------------
> VERTICES: 01/01 [==========================>>] 100% ELAPSED TIME: 0.41 s
> --------------------------------------------------------------------------------
> OK
> 201208 99848 119820 32627 982976 509206 0.000100898
> 201208 99745 119820 32627 982976 509206 0.000100898
> 201208 99739 119820 32627 982976 509206 0.000100898
> 201208 99847 119820 32627 982976 509206 0.000100898
> 201208 613588 119820 32627 982976 509206 0.000100898
> 201208 99809 119820 32627 982976 509206 0.000100898
> 201208 99725 119820 32627 982976 509206 0.000100898
> 201208 99666 119820 32627 982976 509206 0.000100898
> 201208 99743 119820 32627 982976 509206 0.000100898
> 201208 99801 119820 32627 982976 509206 0.000100898
> Retry query with a different approach...
> Query ID = wzheng_20150107185252_8a77f793-cad7-4c6b-b64a-07d8310970b9
> Total jobs = 1
> Launching Job 1 out of 1
> Status: Running (Executing on YARN cluster with App id
> application_1420567249453_0039)
> --------------------------------------------------------------------------------
> VERTICES STATUS TOTAL COMPLETED RUNNING PENDING FAILED
> KILLED
> --------------------------------------------------------------------------------
> Map 1 .......... SUCCEEDED 309 309 0 0 0
> 0
> --------------------------------------------------------------------------------
> VERTICES: 01/01 [==========================>>] 100% ELAPSED TIME: 2.04 s
> --------------------------------------------------------------------------------
> OK
> 201208 99848 119820 32627 982976 509206 0.000100898
> 201208 99745 119820 32627 982976 509206 0.000100898
> 201208 99739 119820 32627 982976 509206 0.000100898
> 201208 99847 119820 32627 982976 509206 0.000100898
> 201208 613588 119820 32627 982976 509206 0.000100898
> 201208 99809 119820 32627 982976 509206 0.000100898
> 201208 99725 119820 32627 982976 509206 0.000100898
> 201208 99666 119820 32627 982976 509206 0.000100898
> 201208 99743 119820 32627 982976 509206 0.000100898
> 201208 99801 119820 32627 982976 509206 0.000100898
> Time taken: 2.748 seconds, Fetched: 10 row(s)
> {code}
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