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https://issues.apache.org/jira/browse/HIVE-14949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eugene Koifman updated HIVE-14949:
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Attachment: HIVE-14949.01.patch
> Enforce that target:source is not 1:N
> -------------------------------------
>
> Key: HIVE-14949
> URL: https://issues.apache.org/jira/browse/HIVE-14949
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Attachments: HIVE-14949.01.patch
>
>
> If > 1 row on source side matches the same row on target side that means that
> we are forced update (or delete) the same row in target more than once as
> part of the same SQL statement. This should raise an error per SQL Spec
> ISO/IEC 9075-2:2011(E)
> Section 14.2 under "General Rules" Item 6/Subitem a/Subitem 2/Subitem B
> There is no sure way to do this via static analysis of the query.
> Can we add something to ROJ operator to pay attention to ROW__ID of target
> side row and compare it with ROW__ID of target side of previous row output?
> If they are the same, that means > 1 source row matched.
> Or perhaps just mark each row in the hash table that it matched. And if it
> matches again, throw an error.
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