[
https://issues.apache.org/jira/browse/HIVE-14946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eugene Koifman updated HIVE-14946:
----------------------------------
Description:
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.
was:
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
> 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
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
