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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2018/10/18 23:35:00 UTC

[jira] [Work started] (HIVE-20775) Factor cost of each SJ reduction when costing a follow-up reduction

     [ https://issues.apache.org/jira/browse/HIVE-20775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-20775 started by Jesus Camacho Rodriguez.
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> Factor cost of each SJ reduction when costing a follow-up reduction
> -------------------------------------------------------------------
>
>                 Key: HIVE-20775
>                 URL: https://issues.apache.org/jira/browse/HIVE-20775
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-20775.patch
>
>
> Currently, while costing the SJ in a plan, the stats of the a TS that is reduced by a SJ are not adjusted after we have decided to keep a SJ in the tree. Ideally, we could adjust the stats to take into account decisions that have already been made.



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