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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1638) convert commonly used udfs to generic udfs
Date Wed, 29 Sep 2010 18:38:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916231#action_12916231
] 

Vladimir Rodionov commented on HIVE-1638:
-----------------------------------------

Correct me if I am wrong, new queries take 23, 42, 93, 79 seconds? What is a wall-to-wall
execution time for these queries?

> convert commonly used udfs to generic udfs
> ------------------------------------------
>
>                 Key: HIVE-1638
>                 URL: https://issues.apache.org/jira/browse/HIVE-1638
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Siying Dong
>         Attachments: HIVE-1638.1.patch
>
>
> Copying a mail from Joy:
> i did a little bit of profiling of a simple hive group by query today. i was surprised
to see that one of the most expensive functions were in converting the equals udf (i had some
simple string filters) to generic udfs. (primitiveobjectinspectorconverter.textconverter)
> am i correct in thinking that the fix is to simply port some of the most popular udfs
(string equality/comparison etc.) to generic udsf?

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