[jira] [Work logged] (HIVE-26671) Incorrect results for group by/order by/limit query with 2 aggregates

Fri, 28 Oct 2022 08:17:14 -0700 


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https://issues.apache.org/jira/browse/HIVE-26671?focusedWorklogId=821497&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-821497
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ASF GitHub Bot logged work on HIVE-26671:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 28/Oct/22 15:16
            Start Date: 28/Oct/22 15:16
    Worklog Time Spent: 10m 
      Work Description: sonarcloud[bot] commented on PR #3706:
URL: https://github.com/apache/hive/pull/3706#issuecomment-1295124637

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 821497)
    Time Spent: 1h 40m  (was: 1.5h)

> Incorrect results for group by/order by/limit query with 2 aggregates
> ---------------------------------------------------------------------
>
>                 Key: HIVE-26671
>                 URL: https://issues.apache.org/jira/browse/HIVE-26671
>             Project: Hive
>          Issue Type: Bug
>          Components: Operators
>            Reporter: Steve Carlin
>            Assignee: Steve Carlin
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> Grabbed this query from the Impala test suite.  It is a query run off of 
> tpcds tables, but it's not really super special.  You will need a lot of data 
> to reproduce this, though.
> select
> l_orderkey,
> min(l_shipdate) as flt,
> count(distinct l_partkey) as cnl 
> from lineitem
> group by l_orderkey order by l_orderkey limit 2;
> The issue is with the Top N Key operator optimizer. The Top N Key operator is 
> the first operator after the Table Scan.  The sort key is on both the 
> l_orderkey and l_partkey columns, but this means that the second sort key 
> might not be forwarded.



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