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https://issues.apache.org/jira/browse/SPARK-36028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17387637#comment-17387637
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Apache Spark commented on SPARK-36028:
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User 'allisonwang-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/33527
> Allow Project to host outer references in scalar subqueries
> -----------------------------------------------------------
>
> Key: SPARK-36028
> URL: https://issues.apache.org/jira/browse/SPARK-36028
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Allison Wang
> Assignee: Allison Wang
> Priority: Major
> Fix For: 3.3.0
>
>
> Support Project to host outer references in subqueries, for example:
> {code:sql}
> SELECT (SELECT c1) FROM t
> {code}
> Currently, it will throw AnalysisException:
> {code}
> org.apache.spark.sql.AnalysisException: Expressions referencing the outer
> query are not supported outside of WHERE/HAVING clauses
> {code}
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