[jira] [Commented] (HIVE-5945) ql.plan.ConditionalResolverCommonJoin.resolveMapJoinTask sums all tables' sizes including those tables which are not used in the child of this conditional task.

["Yin Huai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-5945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13838991#comment-13838991 ] 

Yin Huai commented on HIVE-5945:
--------------------------------

aliasToFileSizeMap should have aliases used in the next stage instead of all tables. 

> ql.plan.ConditionalResolverCommonJoin.resolveMapJoinTask sums all tables' sizes including those tables which are not used in the child of this conditional task.
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-5945
>                 URL: https://issues.apache.org/jira/browse/HIVE-5945
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.13.0
>            Reporter: Yin Huai
>
> Here is an example
> {code}
> select
>    i_item_id,
>    s_state,
>    avg(ss_quantity) agg1,
>    avg(ss_list_price) agg2,
>    avg(ss_coupon_amt) agg3,
>    avg(ss_sales_price) agg4
> FROM store_sales
> JOIN date_dim on (store_sales.ss_sold_date_sk = date_dim.d_date_sk)
> JOIN item on (store_sales.ss_item_sk = item.i_item_sk)
> JOIN customer_demographics on (store_sales.ss_cdemo_sk = customer_demographics.cd_demo_sk)
> JOIN store on (store_sales.ss_store_sk = store.s_store_sk)
> where
>    cd_gender = 'F' and
>    cd_marital_status = 'U' and
>    cd_education_status = 'Primary' and
>    d_year = 2002 and
>    s_state in ('GA','PA', 'LA', 'SC', 'MI', 'AL')
> group by
>    i_item_id,
>    s_state
> order by
>    i_item_id,
>    s_state
> limit 100;
> {\code}
> I turned off noconditionaltask. So, I expected that there will be 4 Map-only jobs for this query. However, I got 1 Map-only job (joining strore_sales and date_dim) and 3 MR job (for reduce joins.)
> So, I checked the conditional task determining the plan of the join involving item. In Hive	
> HiveHIVE-5945
> ql.plan.ConditionalResolverCommonJoin.resolveMapJoinTask, aliasToFileSizeMap contains all input tables used in this query and the intermediate table generated by joining store_sales and date_dim. So, when we sum the size of all small tables, the size of store_sales (which is around 45GB in my test) will be also counted.  



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