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From "Ke Jia (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-17139) Conditional expressions optimization: skip the expression evaluation if the condition is not satisfied for vectorization engine.
Date Thu, 07 Sep 2017 06:51:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-17139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ke Jia updated HIVE-17139:
--------------------------
    Attachment: HIVE-17139.8.patch

> Conditional expressions optimization: skip the expression evaluation if the condition
is not satisfied for vectorization engine.
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-17139
>                 URL: https://issues.apache.org/jira/browse/HIVE-17139
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ke Jia
>            Assignee: Ke Jia
>         Attachments: HIVE-17139.1.patch, HIVE-17139.2.patch, HIVE-17139.3.patch, HIVE-17139.4.patch,
HIVE-17139.5.patch, HIVE-17139.6.patch, HIVE-17139.7.patch, HIVE-17139.8.patch
>
>
> The case when and if statement execution for Hive vectorization is not optimal, which
all the conditional and else expressions are evaluated for current implementation. The optimized
approach is to update the selected array of batch parameter after the conditional expression
is executed. Then the else expression will only do the selected rows instead of all.



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