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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-10940) HiveInputFormat::pushFilters serializes PPD objects for each getRecordReader call
Date Tue, 30 Jun 2015 21:17:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gunther Hagleitner updated HIVE-10940:
--------------------------------------
    Attachment: HIVE-10940.02.patch

.02 sets the expr as a phys opt. This should avoid the overheads and only do it after dpp
is done. I'm wondering if I can unset the filter altogether then (in table scan)

> HiveInputFormat::pushFilters serializes PPD objects for each getRecordReader call
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-10940
>                 URL: https://issues.apache.org/jira/browse/HIVE-10940
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>    Affects Versions: 1.2.0
>            Reporter: Gopal V
>            Assignee: Sergey Shelukhin
>             Fix For: 2.0.0
>
>         Attachments: HIVE-10940.01.patch, HIVE-10940.02.patch, HIVE-10940.patch
>
>
> {code}
>     String filterText = filterExpr.getExprString();
>     String filterExprSerialized = Utilities.serializeExpression(filterExpr);
> {code}
> the serializeExpression initializes Kryo and produces a new packed object for every split.
> HiveInputFormat::getRecordReader -> pushProjectionAndFilters -> pushFilters.
> And Kryo is very slow to do this for a large filter clause.



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