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https://issues.apache.org/jira/browse/SPARK-35093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322568#comment-17322568
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Dongjoon Hyun commented on SPARK-35093:
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Thank you for reporting and fixing this, [~andygrove].
I collect this into a subtask of SPARK-33828 to give more visibility.
> [SQL] AQE columnar mismatch on exchange reuse
> ---------------------------------------------
>
> Key: SPARK-35093
> URL: https://issues.apache.org/jira/browse/SPARK-35093
> Project: Spark
> Issue Type: Sub-task
> 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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