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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-10215) Large IN() clauses: deep hashCode performance during optimizer pass
Date Tue, 25 Aug 2015 03:54:45 GMT

     [ https://issues.apache.org/jira/browse/HIVE-10215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Dere updated HIVE-10215:
------------------------------
    Fix Version/s: 1.2.0

> Large IN() clauses: deep hashCode performance during optimizer pass
> -------------------------------------------------------------------
>
>                 Key: HIVE-10215
>                 URL: https://issues.apache.org/jira/browse/HIVE-10215
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>    Affects Versions: 1.2.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Minor
>             Fix For: 1.2.0
>
>         Attachments: HIVE-10215.1.patch
>
>
> The logical optimizer uses several maps and sets, which are exceeding expensive for large
IN() clauses due to the fact that several part of the queries walk over the lists without
short-circuiting during hashCode(), while equals() is faster due to short-circuiting via less
expensive operators.



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