[jira] [Assigned] (SPARK-40615) Check unsupported data type when decorrelating subqueries

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

     [ https://issues.apache.org/jira/browse/SPARK-40615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-40615:
-----------------------------------

    Assignee: Allison Wang

> Check unsupported data type when decorrelating subqueries
> ---------------------------------------------------------
>
>                 Key: SPARK-40615
>                 URL: https://issues.apache.org/jira/browse/SPARK-40615
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Allison Wang
>            Assignee: Allison Wang
>            Priority: Major
>
> Currently, we don't check if the join condition after subquery decorrelation is resolved or not. This can lead to confusing error messages to users. We should throw proper exceptions when one or more join conditions after decorrelation are not resolved.
> For example:
> {code:java}
> create temp view v1(x) as values from_json('{"a":1, "b":2}', 'map<string,int>') t(x)
> select (select a + a from (select upper(x['a']) as a)) from v1 
> After applying rule org.apache.spark.sql.catalyst.optimizer.PullupCorrelatedPredicates in batch Pullup Correlated Expressions, the structural integrity of the plan is broken.{code}
>  



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