You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2018/08/21 04:10:00 UTC

[jira] [Assigned] (HIVE-20432) Rewrite BETWEEN to IN for integer types for stats estimation

     [ https://issues.apache.org/jira/browse/HIVE-20432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vineet Garg reassigned HIVE-20432:
----------------------------------


> Rewrite BETWEEN to IN for integer types for stats estimation
> ------------------------------------------------------------
>
>                 Key: HIVE-20432
>                 URL: https://issues.apache.org/jira/browse/HIVE-20432
>             Project: Hive
>          Issue Type: Improvement
>    Affects Versions: 4.0.0
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>
> IN clause provides better statistics estimation since predicates are equality based and it keeps into account selectivity of all values. BETWEEN is rewritten into {{>= AND <=}} i.e. non-equality predicates which cause worse estimation. For integer types BETWEEN could be rewritten into IN e.g. BETWEEN 4 and 7 is equivalent to IN (4,5,6,7).



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)