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https://issues.apache.org/jira/browse/SPARK-30151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-30151:
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Assignee: wuyi
> Issue better error message when user-specified schema not match relation
> schema
> -------------------------------------------------------------------------------
>
> Key: SPARK-30151
> URL: https://issues.apache.org/jira/browse/SPARK-30151
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: wuyi
> Assignee: wuyi
> Priority: Major
>
> In DataSource.resolveRelation(), when relation schema does not match
> user-specified schema, it raises exception and says that "$className does not
> allow user-specified schemas." However, it does allow user-specified schema
> if it matches relation schema. Instead, we should issue a better error
> message to tell user what is really happening here, e.g. clarify the
> mismatched fields to user.
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