[jira] [Assigned] (SPARK-31393) Show the correct alias in schema for expression

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-31393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon reassigned SPARK-31393:
------------------------------------

    Assignee: jiaan.geng

> Show the correct alias in schema for expression
> -----------------------------------------------
>
>                 Key: SPARK-31393
>                 URL: https://issues.apache.org/jira/browse/SPARK-31393
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: jiaan.geng
>            Assignee: jiaan.geng
>            Priority: Major
>
> Spark SQL exists some function no elegant implementation alias.
> For example: BitwiseCount override the sql method
> {code:java}
> override def sql: String = s"bit_count(${child.sql})" 
> {code}
> I don't think it's elegant enough.
> Because `Expression` gives the following definitions.
> {code:java}
>   def sql: String = {
>     val childrenSQL = children.map(_.sql).mkString(", ")
>     s"$prettyName($childrenSQL)"
>   }
> {code}
> By this definition, BitwiseCount should override `prettyName` method.



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