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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Work logged] (HIVE-24041) Extend semijoin conversion rules
Date Tue, 25 Aug 2020 14:24:00 GMT


ASF GitHub Bot logged work on HIVE-24041:

                Author: ASF GitHub Bot
            Created on: 25/Aug/20 14:23
            Start Date: 25/Aug/20 14:23
    Worklog Time Spent: 10m 
      Work Description: jcamachor commented on a change in pull request #1405:

File path: ql/src/test/queries/clientpositive/auto_sortmerge_join_10.q
@@ -48,6 +48,8 @@ select count(*) from
   (select a.key as key, a.value as value from tbl2_n4 a where key < 6) subq2
   on subq1.key = subq2.key;

Review comment:
       Yes, this will be tackled in follow-up by @maheshk114 , there is a problem with execution
of semijoin. I will reference the JIRA.

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Issue Time Tracking

    Worklog Id:     (was: 474345)
    Time Spent: 0.5h  (was: 20m)

> Extend semijoin conversion rules
> --------------------------------
>                 Key: HIVE-24041
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
> This patch fixes a couple of limitations that can be seen in {{cbo_query95.q}}, in particular:
> - It adds a rule to trigger semijoin conversion when the there is an aggregate on top
of the join that prunes all columns from left side, and the aggregate operator is on the left
input of the join.
> - It extends existing semijoin conversion rules to prune the unused columns from its
left input, which leads to additional conversion opportunities.

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