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From "Reynold Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-21619) Fail the execution of canonicalized plans explicitly
Date Thu, 03 Aug 2017 21:36:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-21619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113538#comment-16113538
] 

Reynold Xin commented on SPARK-21619:
-------------------------------------

Also self-joins are very difficult to handle. They have different expression ids for resolution,
even though on both sides of the join the plans (at least the subtrees) are semantically equivalent.


> Fail the execution of canonicalized plans explicitly
> ----------------------------------------------------
>
>                 Key: SPARK-21619
>                 URL: https://issues.apache.org/jira/browse/SPARK-21619
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>
> Canonicalized plans are not supposed to be executed. I ran into a case in which there's
some code that accidentally calls execute on a canonicalized plan. This patch throws a more
explicit exception when that happens.



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