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https://issues.apache.org/jira/browse/HIVE-591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732668#action_12732668
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Prasad Chakka commented on HIVE-591:
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this means that user will not be able to add unrelated predicates in the join
clause similar to what can be done in regular join. wouldn't that be a good
thing to have?
> create new type of join ( 1 row for a given key from multiple tables)
> ---------------------------------------------------------------------
>
> Key: HIVE-591
> URL: https://issues.apache.org/jira/browse/HIVE-591
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
>
> It will be useful to support a new type of join:
> say:
> select .. from JOIN TABLES (A,B,C) WITH KEYS (A.key, B.key, C.key) where ....
> The semantics are that for a given key only 1 row is created - nulls are
> present for the the tables which do not contain a row for that key.
> There is no limit on the number of tables, the number of keys should be the
> same as the number of tables.
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