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https://issues.apache.org/jira/browse/HIVE-25822?focusedWorklogId=698488&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-698488
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ASF GitHub Bot logged work on HIVE-25822:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Dec/21 07:55
Start Date: 20/Dec/21 07:55
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on a change in pull request #2891:
URL: https://github.com/apache/hive/pull/2891#discussion_r772145536
##########
File path: ql/src/test/results/clientpositive/llap/join_1to1.q.out
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@@ -373,9 +373,6 @@ NULL NULL NULL 25 10025 66
NULL NULL NULL 30 10030 88
NULL NULL NULL 35 10035 88
NULL NULL NULL 40 10040 88
-NULL NULL NULL 50 10050 66
-NULL NULL NULL 50 10050 66
-NULL NULL NULL 50 10050 88
Review comment:
yes; overwrite without checking tends to happen - that's why I see no
value in the tests which use the `src` table - which content is not defined at
all - one way around these problems is to use `assert_true` ...
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Issue Time Tracking
-------------------
Worklog Id: (was: 698488)
Time Spent: 0.5h (was: 20m)
> Incorrect False positive result rows may be outputted in case outer join has
> conditions only affecting one side
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-25822
> URL: https://issues.apache.org/jira/browse/HIVE-25822
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> needed
> * outer join
> * on condition has at least one condition for one side of the join
> * in a single reducer:
> ** a right hand side only row outputted right before
> ** >=2 rows on LHS and 1 on RHS matching in the join keys but the first LHS
> doesn't satisfies the filter condition
> ** second LHS row with good filter condition
> {code}
> with
> t_y as (select col1 as id,col2 as s from (VALUES(0,'a'),(1,'y')) as c),
> t_xy as (select col1 as id,col2 as s from (VALUES(1,'x'),(1,'y')) as c)
> select * from t_xy l full outer join t_y r on (l.id=r.id and l.s='y');
> {code}
> null,null,1,y is a false positive result
> {code}
> +-------+-------+-------+-------+
> | l.id | l.s | r.id | r.s |
> +-------+-------+-------+-------+
> | NULL | NULL | 0 | a |
> | 1 | x | NULL | NULL |
> | NULL | NULL | 1 | y |
> | 1 | y | 1 | y |
> +-------+-------+-------+-------+
> {code}
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