[jira] [Resolved] (IMPALA-5650) COUNT(*) optimization causes a crash when legacy aggregation is enabled

["Taras Bobrovytsky (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-5650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Taras Bobrovytsky resolved IMPALA-5650.
---------------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 2.10.0

{code}
commit e6c02db9737e39b3a239e0ea8f92a2fd35f3a8fb
Author: Taras Bobrovytsky <tb...@cloudera.com>
Date:   Tue Jul 11 18:38:46 2017 -0700

    IMPALA-5650: Make sum_init_zero a SUM function
    
    The recent Parquet count(*) optimization (IMPALA-5036) introduced a new
    aggregate function sum_init_zero(). This caused an issue for non
    partitioned aggregation node, which checks that the function type is
    either count, min, max, sum or ndv. Since sum_init_zero() was not
    labelled as a sum() function, a DCHECK was hit. This issue is fixed by
    labelling sum_init_zero() as a sum() function.
    
    Testing:
    - Verified that we no longer hit a DCHECK when running a query with a
      Parquet count(*) optimization with legacy agg node enabled.
    
    Change-Id: Ibca53e3ef6bad5283550100b33db55d674cff0b9
    Reviewed-on: http://gerrit.cloudera.org:8080/7404
    Reviewed-by: Michael Ho <kw...@cloudera.com>
    Tested-by: Impala Public Jenkins
{code}

> COUNT(*) optimization causes a crash when legacy aggregation is enabled
> -----------------------------------------------------------------------
>
>                 Key: IMPALA-5650
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5650
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 2.10.0
>            Reporter: Taras Bobrovytsky
>            Assignee: Taras Bobrovytsky
>            Priority: Blocker
>             Fix For: Impala 2.10.0
>
>
> Steps to reproduce:
> # Start Impala with the following flag: -enable_partitioned_aggregation=false
> # Run the following query: {code} select count(*) from tpch_parquet.lineitem {code}
> Impala hits a DCHECK:
> {code}
> aggregation-node.cc:669] Check failed: false bad aggregate operator: 6
> {code}



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