liuyan created HIVE-24712:
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Summary: hive.map.aggr=false and
hive.optimize.reducededuplication=false provide incorrect result on order by
with limit
Key: HIVE-24712
URL: https://issues.apache.org/jira/browse/HIVE-24712
Project: Hive
Issue Type: Improvement
Components: CBO
Affects Versions: 3.1.0
Reporter: liuyan
When Both param set to false , seems the result is not correct, only 35 rows.
This is tested on HDP 3.1.5
set hive.map.aggr=false;
set hive.optimize.reducededuplication=false;
select cs_sold_date_sk,count(distinct cs_order_number) from
tpcds_orc.catalog_sales_orc group by cs_sold_date_sk order by cs_sold_date_sk
limit 200;
----------------------------------------------------------------------------------------------
VERTICES MODE STATUS TOTAL COMPLETED RUNNING PENDING FAILED KILLED
----------------------------------------------------------------------------------------------
Map 1 .......... llap SUCCEEDED 33 33 0 0 0 0
Reducer 2 ...... llap SUCCEEDED 4 4 0 0 0 0
Reducer 3 ...... llap SUCCEEDED 4 4 0 0 0 0
Reducer 4 ...... llap SUCCEEDED 1 1 0 0 0 0
----------------------------------------------------------------------------------------------
VERTICES: 04/04 [==========================>>] 100% ELAPSED TIME: 38.23 s
----------------------------------------------------------------------------------------------
FO :
INFO : Task Execution Summary
INFO :
----------------------------------------------------------------------------------------------
INFO : VERTICES DURATION(ms) CPU_TIME(ms) GC_TIME(ms) INPUT_RECORDS
OUTPUT_RECORDS
INFO :
----------------------------------------------------------------------------------------------
INFO : Map 1 38097.00 0 0 143,997,065 57,447
INFO : Reducer 2 9003.00 0 0 57,447 13,108
INFO : Reducer 3 0.00 0 0 13,108 35
INFO : Reducer 4 0.00 0 0 35 0
INFO :
----------------------------------------------------------------------------------------------
INFO :
INFO : LLAP IO Summary
set hive.map.aggr=true;
set hive.optimize.reducededuplication=false;
select cs_sold_date_sk,count(distinct cs_order_number) from
tpcds_orc.catalog_sales_orc group by cs_sold_date_sk order by cs_sold_date_sk
limit 200;
----------------------------------------------------------------------------------------------
VERTICES MODE STATUS TOTAL COMPLETED RUNNING PENDING FAILED KILLED
----------------------------------------------------------------------------------------------
Map 1 .......... llap SUCCEEDED 33 33 0 0 0 0
Reducer 2 ...... llap SUCCEEDED 4 4 0 0 0 0
Reducer 3 ...... llap SUCCEEDED 2 2 0 0 0 0
Reducer 4 ...... llap SUCCEEDED 1 1 0 0 0 0
----------------------------------------------------------------------------------------------
VERTICES: 04/04 [==========================>>] 100% ELAPSED TIME: 36.24 s
----------------------------------------------------------------------------------------------
INFO :
----------------------------------------------------------------------------------------------
INFO : VERTICES DURATION(ms) CPU_TIME(ms) GC_TIME(ms) INPUT_RECORDS
OUTPUT_RECORDS
INFO :
----------------------------------------------------------------------------------------------
INFO : Map 1 25595.00 0 0 143,997,065 16,703,757
INFO : Reducer 2 18556.00 0 0 16,703,757 800
INFO : Reducer 3 8018.00 0 0 800 200
INFO : Reducer 4 0.00 0 0 200 0
INFO :
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INFO :
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