Burak Yavuz created SPARK-30241:
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             Summary: Make the target table relations not children of 
DELETE/UPDATE/MERGE
                 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


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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