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https://issues.apache.org/jira/browse/SPARK-40618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611293#comment-17611293
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Apache Spark commented on SPARK-40618:
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User 'dtenedor' has created a pull request for this issue:
https://github.com/apache/spark/pull/38052
> Bug in MergeScalarSubqueries rule attempting to merge nested subquery with
> parent
> ---------------------------------------------------------------------------------
>
> Key: SPARK-40618
> URL: https://issues.apache.org/jira/browse/SPARK-40618
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Daniel
> Priority: Major
>
> There is a bug in the `MergeScalarSubqueries` rule for queries with subquery
> expressions nested inside each other, wherein the rule attempts to merge the
> nested subquery with its enclosing parent subquery. The result is not a valid
> plan and raises an exception in the optimizer. Here is a minimal reproducing
> case:
>
> ```
> sql("create table test(col int) using csv")
> checkAnswer(sql("select(select sum((select sum(col) from test)) from test)"),
> Row(null))
> ```
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