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https://issues.apache.org/jira/browse/HIVE-3463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466647#comment-13466647
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Harsh J commented on HIVE-3463:
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DN does have cascading support:
http://www.datanucleus.org/products/datanucleus/jdo/orm/cascading.html
> 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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