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https://issues.apache.org/jira/browse/SPARK-36063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-36063.
---------------------------------
Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 33284
[https://github.com/apache/spark/pull/33284]
> Optimize OneRowRelation subqueries
> ----------------------------------
>
> Key: SPARK-36063
> URL: https://issues.apache.org/jira/browse/SPARK-36063
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Allison Wang
> Assignee: Allison Wang
> Priority: Major
> Fix For: 3.2.0
>
>
> Inline subqueries with OneRowRelation as leaf nodes instead of decorrelating
> and rewriting them as left outer joins.
> Scalar subquery:
> ```
> SELECT (SELECT c1) FROM t1 -> SELECT c1 FROM t1
> ```
> Lateral subquery:
> ```
> SELECT * FROM t1, LATERAL (SELECT c1, c2) -> SELECT c1, c2 , c1, c2 FROM t1
> ```
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