[jira] [Resolved] (SPARK-27701) Extend NestedColumnAliasing to more nested field cases

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-27701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun resolved SPARK-27701.
-----------------------------------
       Resolution: Fixed
         Assignee: Liang-Chi Hsieh
    Fix Version/s: 3.0.0

This is resolved via https://github.com/apache/spark/pull/24599

> Extend NestedColumnAliasing to more nested field cases
> ------------------------------------------------------
>
>                 Key: SPARK-27701
>                 URL: https://issues.apache.org/jira/browse/SPARK-27701
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Liang-Chi Hsieh
>            Assignee: Liang-Chi Hsieh
>            Priority: Major
>             Fix For: 3.0.0
>
>
> {{NestedColumnAliasing}} rule covers {{GetStructField}} only, currently. It means that some nested field extraction expressions aren't pruned. For example, if only accessing a nested field in an array of struct, this column isn't pruned. This patch extends the rule to cover such cases.



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