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https://issues.apache.org/jira/browse/SPARK-35545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-35545:
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Assignee: Allison Wang
> Split SubqueryExpression's children field into outer attributes and join
> conditions
> -----------------------------------------------------------------------------------
>
> Key: SPARK-35545
> URL: https://issues.apache.org/jira/browse/SPARK-35545
> Project: Spark
> Issue Type: Task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Allison Wang
> Assignee: Allison Wang
> Priority: Major
>
> Currently the children field of a subquery expression is used to store both
> collected outer references inside the subquery plan, and also join conditions
> after correlated predicates are pulled up. For example
> SELECT (SELECT max(c1) FROM t1 WHERE t1.c1 = t2.c1) FROM t2
> After analysis phase:
> scalar-subquery [t2.c1]
> After PullUpCorrelatedPredicates:
> scalar-subquery [t1.c1 = t2.c1]
> The references for a subquery expressions is also confusing:
> override lazy val references: AttributeSet =
> if (plan.resolved) super.references -- plan.outputSet else super.references
> We should split this children field into outer attribute references and join
> conditions.
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