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From "Laljo John Pullokkaran (JIRA)" <>
Subject [jira] [Updated] (HIVE-11110) Reorder applyPreJoinOrderingTransforms, add NotNULL/FilterMerge rules, improve Filter selectivity estimation
Date Thu, 26 Nov 2015 04:27:10 GMT


Laljo John Pullokkaran updated HIVE-11110:
    Attachment: HIVE-11110.26.patch

> Reorder applyPreJoinOrderingTransforms, add NotNULL/FilterMerge rules, improve Filter
selectivity estimation
> ------------------------------------------------------------------------------------------------------------
>                 Key: HIVE-11110
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Laljo John Pullokkaran
>         Attachments: HIVE-11110-10.patch, HIVE-11110-11.patch, HIVE-11110-12.patch, HIVE-11110-branch-1.2.patch,
HIVE-11110.1.patch, HIVE-11110.13.patch, HIVE-11110.14.patch, HIVE-11110.15.patch, HIVE-11110.16.patch,
HIVE-11110.17.patch, HIVE-11110.18.patch, HIVE-11110.19.patch, HIVE-11110.2.patch, HIVE-11110.20.patch,
HIVE-11110.21.patch, HIVE-11110.22.patch, HIVE-11110.23.patch, HIVE-11110.24.patch, HIVE-11110.25.patch,
HIVE-11110.26.patch, HIVE-11110.4.patch, HIVE-11110.5.patch, HIVE-11110.6.patch, HIVE-11110.7.patch,
HIVE-11110.8.patch, HIVE-11110.9.patch, HIVE-11110.91.patch, HIVE-11110.92.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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