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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/12/08 01:43:00 UTC

[jira] [Commented] (SPARK-33697) UnionExec should require column ordering in RemoveRedundantProjects

    [ https://issues.apache.org/jira/browse/SPARK-33697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17245609#comment-17245609 ] 

Apache Spark commented on SPARK-33697:
--------------------------------------

User 'allisonwang-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/30659

> UnionExec should require column ordering in RemoveRedundantProjects
> -------------------------------------------------------------------
>
>                 Key: SPARK-33697
>                 URL: https://issues.apache.org/jira/browse/SPARK-33697
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Allison Wang
>            Priority: Major
>
> UnionExec requires its children's columns to have the same order in order to merge the columns. Currently, the physical rule `RemoveRedundantProjects` can pass through the ordering requirements from its parent and incorrectly remove the necessary project nodes below a union operation.



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