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https://issues.apache.org/jira/browse/SPARK-48557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-48557.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 46902
[https://github.com/apache/spark/pull/46902]
> Support scalar subquery with group-by on column equal to constant
> -----------------------------------------------------------------
>
> Key: SPARK-48557
> URL: https://issues.apache.org/jira/browse/SPARK-48557
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Jack Chen
> Assignee: Jack Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> For example, this query is currently unsupported but can be allowed, because
> the filter y2 = 1 guarantees that the group-by has only one value.
> {code:java}
> select *, (select count(*) from y where x1 = y1 and y2 = 1 group by y2) from
> x; {code}
>
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