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Date: Thu, 13 Nov 2014 06:41:34 +0000 (UTC)
From: "JongWon Park (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12744494.1411835338000.488798.1415860894312@Atlassian.JIRA>
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 <JIRA.12744494.1411835338535@arcas>
Subject: [jira] [Commented] (HIVE-8284) Equality comparison is done between
 two floating point variables in HiveRelMdUniqueKeys#getUniqueKeys()
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    [ https://issues.apache.org/jira/browse/HIVE-8284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14209379#comment-14209379 ] 

JongWon Park commented on HIVE-8284:
------------------------------------

Thanks, Ashutosh!

> Equality comparison is done between two floating point variables in HiveRelMdUniqueKeys#getUniqueKeys()
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-8284
>                 URL: https://issues.apache.org/jira/browse/HIVE-8284
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>    Affects Versions: 0.14.0
>            Reporter: Ted Yu
>            Assignee: JongWon Park
>            Priority: Minor
>             Fix For: 0.15.0
>
>         Attachments: HIVE-8284.patch
>
>
> {code}
>     double numRows = tScan.getRows();
> ...
>         double r = cStat.getRange().maxValue.doubleValue() -
>             cStat.getRange().minValue.doubleValue() + 1;
>         isKey = (numRows == r);
> {code}
> The equality check should use a small epsilon as tolerance.


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