[jira] [Commented] (SPARK-8658) AttributeReference equals method only compare name, exprId and dataType

["Xiao Li (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-8658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14949946#comment-14949946 ] 

Xiao Li commented on SPARK-8658:
--------------------------------

Hi, Michael and Antonio, 

Trying to understand the problem and fix it if I can. Expression ID is the same but their qualifiers are different???

Could you give a query sample? I am trying to reproduce the problem? Is this problem related to a self join?   

Thanks, 

Xiao Li

> AttributeReference equals method only compare name, exprId and dataType
> -----------------------------------------------------------------------
>
>                 Key: SPARK-8658
>                 URL: https://issues.apache.org/jira/browse/SPARK-8658
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.3.0, 1.3.1, 1.4.0
>            Reporter: Antonio Jesus Navarro
>
> The AttributeReference "equals" method only accept as different objects with different name, expression id or dataType. With this behavior when I tried to do a "transformExpressionsDown" and try to transform qualifiers inside "AttributeReferences", these objects are not replaced, because the transformer considers them equal.
> I propose to add to the "equals" method this variables:
> name, dataType, nullable, metadata, epxrId, qualifiers



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