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https://issues.apache.org/jira/browse/HIVE-14946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eugene Koifman reassigned HIVE-14946:
-------------------------------------
Assignee: Eugene Koifman
> Optimizations
> -------------
>
> Key: HIVE-14946
> URL: https://issues.apache.org/jira/browse/HIVE-14946
> Project: Hive
> Issue Type: Sub-task
> Components: Query Planning, Transactions
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
>
> For example, if there is only WHEN NOT MATCHED clause, the base generating
> expression can be an INNER JOIN
> Generally, we should make sure the optimizer is able to work with the plan
> for Merge statement
> Various WHEN clauses can have "extra" predicates. In some cases they may be
> pushable.
> The "source" can be an arbitrary expression - in particular it may include
> joins which together with the join introduced by Merge itself may need to be
> reordered.
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