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https://issues.apache.org/jira/browse/SPARK-31393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-31393.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 28164
[https://github.com/apache/spark/pull/28164]
> 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
> Fix For: 3.0.0
>
>
> 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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