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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-22064) CBO: Rewrite year() predicate to a constant condition
Date Tue, 30 Jul 2019 22:50:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-22064?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-22064:
---------------------------
    Component/s: CBO

> CBO: Rewrite year() predicate to a constant condition
> -----------------------------------------------------
>
>                 Key: HIVE-22064
>                 URL: https://issues.apache.org/jira/browse/HIVE-22064
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Gopal V
>            Priority: Major
>
> {code}
> CREATE TEMPORARY TABLE users (signup_date date, user_id bigint) stored as ORC;
> INSERT INTO users values("1999-01-01", 1);
> EXPLAIN ANALYZE
> SELECT year(signup_date), count(distinct user_id) from users where 
> year(signup_date) BETWEEN 2017 and 2019
> GROUP BY year(signup_date);
> {code}
> The YEAR() or EXTRACT(.... YEAR) is not rewritten into a constant for push-down.
> {code}
> EXPLAIN ANALYZE
> SELECT year(signup_date), count(distinct user_id) from users where 
> signup_date BETWEEN DATE'2017-01-01' and DATE'2019-12-31'
> GROUP BY year(signup_date);
> {code}
> Does push-down into the storage layers.



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