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Posted to issues@spark.apache.org by "Kent Yao (Jira)" <ji...@apache.org> on 2021/03/13 05:52:00 UTC
[jira] [Resolved] (SPARK-34188) Char varchar length check blocks
CBO statistics
[ https://issues.apache.org/jira/browse/SPARK-34188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kent Yao resolved SPARK-34188.
------------------------------
Resolution: Not A Problem
applied another solution, not a problem anymore
> 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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