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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/05/16 03:51:00 UTC
[jira] [Commented] (SPARK-31393) Show the correct alias in schema
for expression
[ https://issues.apache.org/jira/browse/SPARK-31393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17108832#comment-17108832 ]
Apache Spark commented on SPARK-31393:
--------------------------------------
User 'beliefer' has created a pull request for this issue:
https://github.com/apache/spark/pull/28551
> 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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