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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HIVE-15474) Extend limit propagation for chain of RS-GB-RS operators
Date Tue, 20 Dec 2016 12:01:58 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HIVE-15474 started by Jesus Camacho Rodriguez.
------------------------------------------------------
> Extend limit propagation for chain of RS-GB-RS operators
> --------------------------------------------------------
>
>                 Key: HIVE-15474
>                 URL: https://issues.apache.org/jira/browse/HIVE-15474
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>    Affects Versions: 2.2.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>
> The goal is to extend the work started in HIVE-14002.
> For instance, given the following query:
> {code:sql}
> explain
> select key, value, count(key + 1) as agg1 from src 
> group by key, value
> order by key, value, agg1 limit 20;
> {code}
> We can push the limit to the GBy operator. However, currently we do not do it.



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