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From "Damien Carol (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-8313) Optimize evaluation for ExprNodeConstantEvaluator and ExprNodeNullEvaluator
Date Wed, 01 Oct 2014 07:33:34 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Damien Carol updated HIVE-8313:
-------------------------------
    Description: 
Consider the following query:

{code:sql}
SELECT foo, bar, goo, id
FROM myTable
WHERE id IN ( 'A', 'B', 'C', 'D', ... , 'ZZZZZZ' );
{code}

One finds that when the IN clause has several thousand elements (and the table has several
million rows), the query above takes orders-of-magnitude longer to run on Hive 0.12 than say
Hive 0.10.

I have a possibly incomplete fix.

  was:
Consider the following query:

{code}
SELECT foo, bar, goo, id
FROM myTable
WHERE id IN { 'A', 'B', 'C', 'D', ... , 'ZZZZZZ' };
{code}

One finds that when the IN clause has several thousand elements (and the table has several
million rows), the query above takes orders-of-magnitude longer to run on Hive 0.12 than say
Hive 0.10.

I have a possibly incomplete fix.


> Optimize evaluation for ExprNodeConstantEvaluator and ExprNodeNullEvaluator
> ---------------------------------------------------------------------------
>
>                 Key: HIVE-8313
>                 URL: https://issues.apache.org/jira/browse/HIVE-8313
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.12.0, 0.13.0, 0.14.0
>            Reporter: Mithun Radhakrishnan
>            Assignee: Mithun Radhakrishnan
>         Attachments: HIVE-8313.1.patch
>
>
> Consider the following query:
> {code:sql}
> SELECT foo, bar, goo, id
> FROM myTable
> WHERE id IN ( 'A', 'B', 'C', 'D', ... , 'ZZZZZZ' );
> {code}
> One finds that when the IN clause has several thousand elements (and the table has several
million rows), the query above takes orders-of-magnitude longer to run on Hive 0.12 than say
Hive 0.10.
> I have a possibly incomplete fix.



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