[jira] [Assigned] (SPARK-40033) Nested schema pruning support through element_at

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

     [ https://issues.apache.org/jira/browse/SPARK-40033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-40033:
------------------------------------

    Assignee: Apache Spark

> Nested schema pruning support through element_at
> ------------------------------------------------
>
>                 Key: SPARK-40033
>                 URL: https://issues.apache.org/jira/browse/SPARK-40033
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: XiDuo You
>            Assignee: Apache Spark
>            Priority: Major
>
> The semantics of element_at is similar with GetArrayItem and GetMapValue, so we can support do nested schema pruning if the inside data type is struct.
> For example:
> For a column schema: `c: array<struct<s1: int, s2: string>>`
> With the query: `SELECT element_at(c, 1).s1`
> The final pruned schema should be `c: array<struct<s1: int>>`



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