[jira] [Commented] (SPARK-35093) [SQL] AQE columnar mismatch on exchange reuse

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-35093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322452#comment-17322452 ] 

Apache Spark commented on SPARK-35093:
--------------------------------------

User 'andygrove' has created a pull request for this issue:
https://github.com/apache/spark/pull/32195

> [SQL] AQE columnar mismatch on exchange reuse
> ---------------------------------------------
>
>                 Key: SPARK-35093
>                 URL: https://issues.apache.org/jira/browse/SPARK-35093
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.2, 3.1.1
>            Reporter: Andy Grove
>            Priority: Major
>
> With AQE enabled, AdaptiveSparkPlanExec will attempt to reuse exchanges that are semantically equal.
> This is done by comparing the canonicalized plan for two Exchange nodes to see if they are the same.
> Unfortunately this does not take into account the fact that two exchanges with the same canonical plan might be replaced by a plugin in a way that makes them not compatible. For example, a plugin could create one version with supportsColumnar=true and another with supportsColumnar=false. It is not valid to re-use exchanges if there is a supportsColumnar mismatch.
> I have tested a fix for this and will put up a PR once I figure out how to write the tests.
>  
>  



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