[jira] [Assigned] (SPARK-40974) EXPODE function selects outer column

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-40974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-40974:
------------------------------------

    Assignee:     (was: Apache Spark)

> EXPODE function selects outer column
> ------------------------------------
>
>                 Key: SPARK-40974
>                 URL: https://issues.apache.org/jira/browse/SPARK-40974
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: Omar Ismail
>            Priority: Minor
>
> Im trying to determine if indirectly selecting an outer column is a bug or an intended feature of the EXPLODE function. 
>  
> If I run the following SQL statement:
> ```
> SELECT
>       (SELECT FIRST(name_element_)
>         FROM LATERAL VIEW EXPLODE(name) AS name_element_
>        *)*
> FROM patient
> ```
>  
> it fails with:
> ```
> Accessing outer query column is not allowed in:
> Generate explode(outer(name#9628))
> ```
>  
> However, if I do a "cheeky select" (bolded below), the SQL query is valid and runs:
> ```
> SELECT(
>     SELECT FIRST(name_element_)
>     FROM (SELECT EXPLODE(name_element_) AS name_element_ 
>           \{*}FROM ({*}{*}SELECT{*} *name AS name_element_)*
>         **        )
>          )
> FROM patient
> ```
> From the viewpoint of the EXPLODE function, it seems like the column name_element_ does not come from an outer column. Is this an intended feature or a bug?



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