Wei Zheng created HIVE-9382:
-------------------------------
Summary: Query got rerun with Global Limit optimization on and
Limit 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
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,
{panel}
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)
{panel}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
