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Posted to dev@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2014/10/21 03:22:34 UTC

[jira] [Updated] (HIVE-8531) Fold is not null filter if there are other comparison filter present on table

     [ https://issues.apache.org/jira/browse/HIVE-8531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan updated HIVE-8531:
-----------------------------------
    Attachment: HIVE-8531.patch

> Fold is not null filter if there are other comparison filter present on table
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-8531
>                 URL: https://issues.apache.org/jira/browse/HIVE-8531
>             Project: Hive
>          Issue Type: New Feature
>          Components: Logical Optimizer
>    Affects Versions: 0.14.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-8531.patch
>
>
> e.g., select * from src where key = '86' and key is not null;
> is equivalent to
> select * from src where key = '86';
> we can short circuit is not null filter and avoid its evaluation for every row at runtime.



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