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https://issues.apache.org/jira/browse/SPARK-40033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh reassigned SPARK-40033:
-----------------------------------
Assignee: XiDuo You
> 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: XiDuo You
> Priority: Major
> Fix For: 3.4.0
>
>
> 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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