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Date: Fri, 19 Sep 2014 19:02:34 +0000 (UTC)
From: "Gopal V (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12742654.1411108618000.80125.1411153354626@Atlassian.JIRA>
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 <JIRA.12742654.1411108618204@arcas>
Subject: [jira] [Commented] (HIVE-8188)
 ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a
 tight loop
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    [ https://issues.apache.org/jira/browse/HIVE-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14141095#comment-14141095 ] 

Gopal V commented on HIVE-8188:
-------------------------------

[~prasanth_j]: that is pretty neat, speedup.

But that's not the place I found the fix in, it was in isDeterministic() within the Constant codepath in ExprNode evaluator.

> ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a tight loop
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-8188
>                 URL: https://issues.apache.org/jira/browse/HIVE-8188
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>    Affects Versions: 0.14.0
>            Reporter: Gopal V
>         Attachments: udf-deterministic.png
>
>
> When running a near-constant UDF, most of the CPU is burnt within the VM trying to read the class annotations for every row.
> !udf-deterministic.png!


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