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https://issues.apache.org/jira/browse/HIVE-3463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463651#comment-13463651
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Carl Steinbach commented on HIVE-3463:
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I'm opposed to only modifying the schema scripts (without updating JDO) unless
we can prove that DN doesn't support cascading deletes via JDO. The relations
that we need to tag with cascading deletes can be inferred by mapping the
schema back to the original JDO file.
> Add CASCADING to MySQL's InnoDB schema
> --------------------------------------
>
> Key: HIVE-3463
> URL: https://issues.apache.org/jira/browse/HIVE-3463
> Project: Hive
> Issue Type: Improvement
> Components: Metastore
> Affects Versions: 0.9.0
> Reporter: Alexander Alten-Lorenz
> Assignee: Alexander Alten-Lorenz
>
> Cascading could help to cleanup the tables when a FK is deleted.
> http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html
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