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https://issues.apache.org/jira/browse/SPARK-34188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269133#comment-17269133
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Apache Spark commented on SPARK-34188:
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User 'yaooqinn' has created a pull request for this issue:
https://github.com/apache/spark/pull/31278
> Char varchar length check blocks CBO statistics
> -----------------------------------------------
>
> Key: SPARK-34188
> URL: https://issues.apache.org/jira/browse/SPARK-34188
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Kent Yao
> Priority: Major
> Attachments: screenshot-1.png
>
>
> !screenshot-1.png!
> the char varchar length check changes the output by projection and the filter
> push down through the projection with the new unaliased output, the CBO
> estimation can not recognize
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