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https://issues.apache.org/jira/browse/SPARK-41441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-41441:
-----------------------------------
Assignee: Allison Wang
> Allow Generate with no required child output to host outer references
> ---------------------------------------------------------------------
>
> Key: SPARK-41441
> URL: https://issues.apache.org/jira/browse/SPARK-41441
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Allison Wang
> Assignee: Allison Wang
> Priority: Major
>
> Currently, in CheckAnalysis, Spark disallows Generate to host any outer
> references when it's required child output is not empty. But when the child
> output is empty, it can host outer references, which DecorrelateInnerQuery
> does not handle.
> For example,
> {code:java}
> select * from t, lateral (select explode(array(c1, c2))){code}
> This throws an internal error :
> {code:java}
> Caused by: java.lang.AssertionError: assertion failed: Correlated column is
> not allowed in Generate explode(array(outer(c1#219), outer(c2#220))), false,
> [col#221] +- OneRowRelation{code}
> We should support Generate to host outer references when its required child
> output is empty.
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