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From "Carl Steinbach (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-591) create new type of join ( 1 row for a given key from multiple tables) (UNIQUEJOIN)
Date Mon, 26 Jul 2010 06:00:52 GMT

     [ https://issues.apache.org/jira/browse/HIVE-591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Carl Steinbach updated HIVE-591:
--------------------------------

    Fix Version/s: 0.5.0

> create new type of join ( 1 row for a given key from multiple tables) (UNIQUEJOIN)
> ----------------------------------------------------------------------------------
>
>                 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
>            Assignee: Emil Ibrishimov
>             Fix For: 0.5.0
>
>         Attachments: HIVE-591.1.patch, HIVE-591.2.patch, HIVE-591.3.patch, HIVE-591.4.patch
>
>
> 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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