[jira] [Assigned] (SPARK-45009) Correlated EXISTS subqueries in join ON condition unsupported and fail with internal error

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-45009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-45009:
-----------------------------------

    Assignee: Jack Chen

> Correlated EXISTS subqueries in join ON condition unsupported and fail with internal error
> ------------------------------------------------------------------------------------------
>
>                 Key: SPARK-45009
>                 URL: https://issues.apache.org/jira/browse/SPARK-45009
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Jack Chen
>            Assignee: Jack Chen
>            Priority: Major
>              Labels: pull-request-available
>
> They are not handled in decorrelation, and we also don’t have any checks to block them, so these queries have outer references in the query plan leading to internal errors:
> {code:java}
> CREATE TEMP VIEW x(x1, x2) AS VALUES (0, 1), (1, 2);
> CREATE TEMP VIEW y(y1, y2) AS VALUES (0, 2), (0, 3);
> CREATE TEMP VIEW z(z1, z2) AS VALUES (0, 2), (0, 3);
> select * from x left join y on x1 = y1 and exists (select * from z where z1 = x1)
> Error occurred during query planning: 
> org.apache.spark.sql.catalyst.plans.logical.Filter cannot be cast to org.apache.spark.sql.execution.SparkPlan {code}
> PullupCorrelatedPredicates#apply and RewritePredicateSubquery only handle subqueries in UnaryNode, it seems to assume that they cannot occur elsewhere, like in a join ON condition.
> We will need to decide whether to block them properly in analysis (i.e. give a proper error for them), or see if we can add support for them.
> Also note, scalar subqueries in the ON condition are unsupported too but return a proper error.



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