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https://issues.apache.org/jira/browse/SPARK-30241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Burak Yavuz resolved SPARK-30241.
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Resolution: Not A Problem
> Make the target table relations not children of DELETE/UPDATE/MERGE
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>
> Key: SPARK-30241
> URL: https://issues.apache.org/jira/browse/SPARK-30241
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Burak Yavuz
> Assignee: Burak Yavuz
> Priority: Major
>
> Having the targets of DELETE/UPDATE/MERGE as children can cause bad
> interactions with other catalyst rules that may want to perform actions
> assuming a child is a "read-only" relation. This is precisely why AlterTable
> and DescribeTable have the targets as variables only and not children.
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