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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11110) Enable HiveJoinAddNotNullRule in CBO
Date Wed, 01 Jul 2015 21:07:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan updated HIVE-11110:
------------------------------------
    Attachment: HIVE-11110.2.patch

Reupload for QA run.

> Enable HiveJoinAddNotNullRule in CBO
> ------------------------------------
>
>                 Key: HIVE-11110
>                 URL: https://issues.apache.org/jira/browse/HIVE-11110
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-11110.1.patch, HIVE-11110.2.patch, HIVE-11110.patch
>
>
> Query
> {code}
> select  count(*)
>  from store_sales
>      ,store_returns
>      ,date_dim d1
>      ,date_dim d2
>  where d1.d_quarter_name = '2000Q1'
>    and d1.d_date_sk = ss_sold_date_sk
>    and ss_customer_sk = sr_customer_sk
>    and ss_item_sk = sr_item_sk
>    and ss_ticket_number = sr_ticket_number
>    and sr_returned_date_sk = d2.d_date_sk
>    and d2.d_quarter_name in ('2000Q1','2000Q2','2000Q3’);
> {code}
> The store_sales table is partitioned on ss_sold_date_sk, which is also used in a join
clause. The join clause should add a filter “filterExpr: ss_sold_date_sk is not null”,
which should get pushed the MetaStore when fetching the stats. Currently this is not done
in CBO planning, which results in the stats from __HIVE_DEFAULT_PARTITION__ to be fetched
and considered in the optimization phase. In particular, this increases the NDV for the join
columns and may result in wrong planning.
> Including HiveJoinAddNotNullRule in the optimization phase solves this issue.



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