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From "Krisztian Kasa (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-23206) Project not defined correctly after reordering a join
Date Mon, 04 May 2020 07:57:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Krisztian Kasa updated HIVE-23206:
----------------------------------
    Attachment: HIVE-23206.6.patch

> Project not defined correctly after reordering a join
> -----------------------------------------------------
>
>                 Key: HIVE-23206
>                 URL: https://issues.apache.org/jira/browse/HIVE-23206
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Steve Carlin
>            Assignee: Krisztian Kasa
>            Priority: Major
>         Attachments: HIVE-23206.1.patch, HIVE-23206.2.patch, HIVE-23206.3.patch, HIVE-23206.4.patch,
HIVE-23206.5.patch, HIVE-23206.6.patch
>
>
> The following highlighted line seems to be incorrect in the test suite:
> [https://github.com/apache/hive/blob/master/ql/src/test/results/clientpositive/perf/tez/cbo_query95.q.out#L89]
> Note that the project takes all the columns from the table scan, yet it only needs a
couple of them.
> I did some very small debugging on this.  When I removed the applyJoinOrderingTransform
here: [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java#L1897]
> ... the problem goes away.  So presumably one of the rules in there is causing the problem.
> Here is a slightly simplified version of the query which has the same problem (using
the same tpc-ds database):
> explain cbo with ws_wh as
> (select ws1.ws_order_number
> from web_sales ws1,web_returns wr2 
> where ws1.ws_order_number = wr2.wr_order_number)
> select 
>    ws_order_number
> from
>    web_sales ws1 
> where
> ws1.ws_order_number in (select wr_order_number
>                             from web_returns,ws_wh
>                             where wr_order_number = ws_wh.ws_order_number)
>  



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