[jira] [Assigned] (SPARK-27633) Remove redundant aliases in NestedColumnAliasing

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

     [ https://issues.apache.org/jira/browse/SPARK-27633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-27633:
------------------------------------

    Assignee:     (was: Apache Spark)

> Remove redundant aliases in NestedColumnAliasing
> ------------------------------------------------
>
>                 Key: SPARK-27633
>                 URL: https://issues.apache.org/jira/browse/SPARK-27633
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Liang-Chi Hsieh
>            Priority: Major
>
> In NestedColumnAliasing rule, we create aliases for nested field access in project list. We considered that top level parent field and nested fields under it were both accessed. In the case, we don't create the aliases because they are redundant.
> There is another case, where a nested parent field and nested fields under it were both accessed, which we don't consider now. We don't need to create aliases in this case too.



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