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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13713) We miss vectorization in a case of count(*) when aggregation mode is COMPLETE
Date Sun, 08 May 2016 06:10:12 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt McCline updated HIVE-13713:
--------------------------------
    Description: 
E.g. vectorization_limit.q doesn't vectorize Reducer 2 for the query:

{code}
"select ctinyint, count(distinct(cdouble)) from alltypesorc group by ctinyint order by ctinyint
limit 20"
{code}

It was producing a stack trace like:

{code}
Vector aggregate not implemented: "count" for type: "NONE (reduce-merge-partial = true)
{code}

  was:
E.g. vectorization_limit.q doesn't vectorize Reducer 2 for the query:

{code}
"select ctinyint, count(distinct(cdouble)) from alltypesorc group by ctinyint order by ctinyint
limit 20"
{code}

It was throwing an error like:

{code}
Vector aggregate not implemented: "count" for type: "NONE (reduce-merge-partial = true)
{code}


> We miss vectorization in a case of count(*) when aggregation mode is COMPLETE
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-13713
>                 URL: https://issues.apache.org/jira/browse/HIVE-13713
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: HIVE-13713.01.patch
>
>
> E.g. vectorization_limit.q doesn't vectorize Reducer 2 for the query:
> {code}
> "select ctinyint, count(distinct(cdouble)) from alltypesorc group by ctinyint order by
ctinyint limit 20"
> {code}
> It was producing a stack trace like:
> {code}
> Vector aggregate not implemented: "count" for type: "NONE (reduce-merge-partial = true)
> {code}



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