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https://issues.apache.org/jira/browse/SPARK-45583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Bruce Robbins resolved SPARK-45583.
-----------------------------------
Resolution: Fixed
> Spark SQL returning incorrect values for full outer join on keys with the
> same name.
> ------------------------------------------------------------------------------------
>
> Key: SPARK-45583
> URL: https://issues.apache.org/jira/browse/SPARK-45583
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.4.1
> Reporter: Huw
> Priority: Major
> Fix For: 3.5.0
>
>
> {{The following query gives the wrong results.}}
>
> {{WITH people as (}}
> {{ SELECT * FROM (VALUES }}
> {{ (1, 'Peter'), }}
> {{ (2, 'Homer'), }}
> {{ (3, 'Ned'),}}
> {{ (3, 'Jenny')}}
> {{ ) AS Idiots(id, FirstName)}}
> {{{}){}}}{{{}, location as ({}}}
> {{ SELECT * FROM (VALUES}}
> {{ (1, 'sample0'),}}
> {{ (1, 'sample1'),}}
> {{ (2, 'sample2') }}
> {{ ) as Locations(id, address)}}
> {{{}){}}}{{{}SELECT{}}}
> {{ *}}
> {{FROM}}
> {{ people}}
> {{FULL OUTER JOIN}}
> {{ location}}
> {{ON}}
> {{ people.id = location.id}}
> {{We find the following table:}}
> ||id: integer||FirstName: string||id: integer||address: string||
> |2|Homer|2|sample2|
> |null|Ned|null|null|
> |null|Jenny|null|null|
> |1|Peter|1|sample0|
> |1|Peter|1|sample1|
> {{But clearly the first `id` column is wrong, the nulls should be 3.}}
> If we rename the id column in (only) the person table to pid we get the
> correct results:
> ||pid: integer||FirstName: string||id: integer||address: string||
> |2|Homer|2|sample2|
> |3|Ned|null|null|
> |3|Jenny|null|null|
> |1|Peter|1|sample0|
> |1|Peter|1|sample1|
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