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https://issues.apache.org/jira/browse/HIVE-23836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Mollitor resolved HIVE-23836.
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Fix Version/s: 4.0.0
Resolution: Fixed
Pushed to master! Thanks.
> Make "cols" dependent so that it cascade deletes
> ------------------------------------------------
>
> Key: HIVE-23836
> URL: https://issues.apache.org/jira/browse/HIVE-23836
> Project: Hive
> Issue Type: Bug
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Minor
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> {quote}
> If you want the deletion of a persistent object to cause the deletion of
> related objects then you need to mark the related fields in the mapping to be
> "dependent".
> {quote}
> http://www.datanucleus.org/products/accessplatform/jdo/persistence.html#dependent_fields
> http://www.datanucleus.org/products/datanucleus/jdo/persistence.html#_deleting_an_object
> The database won't do it:
> {code:sql|title=Derby Schema}
> ALTER TABLE "APP"."COLUMNS_V2" ADD CONSTRAINT "COLUMNS_V2_FK1" FOREIGN KEY
> ("CD_ID") REFERENCES "APP"."CDS" ("CD_ID") ON DELETE NO ACTION ON UPDATE NO
> ACTION;
> {code}
> https://github.com/apache/hive/blob/65cf6957cf9432277a096f91b40985237274579f/standalone-metastore/metastore-server/src/main/sql/derby/hive-schema-4.0.0.derby.sql#L452
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