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From "Charles Chen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HIVE-2325) Left semi join does not allow filter on right table
Date Mon, 01 Aug 2011 22:15:48 GMT

     [ https://issues.apache.org/jira/browse/HIVE-2325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Charles Chen resolved HIVE-2325.
--------------------------------

    Resolution: Invalid

Wiki states "The restrictions of using LEFT SEMI JOIN is that the right-hand-side table should
only be referenced in the join condition (ON-clause), but not in WHERE- or SELECT-clauses
etc."

> Left semi join does not allow filter on right table
> ---------------------------------------------------
>
>                 Key: HIVE-2325
>                 URL: https://issues.apache.org/jira/browse/HIVE-2325
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.7.1
>            Reporter: Charles Chen
>
> Given
> {noformat}
> create table invites (foo int, bar string) partitioned by (ds string);
> create table invites2 (foo int, bar string) partitioned by (ds string);
> explain select * from invites left semi join invites2 on invites.ds=invites2.ds where
invites2.ds='2011-01-01';
> {noformat}
> an error:
> {noformat}
> FAILED: Error in semantic analysis: Line 1:86 Invalid table alias or column reference
'invites2': (possible column names are: _col0, _col1, _col2)
> {noformat}
> is returned.
> Presumably the groupby operation in the semi join doesn't preserve the column names?

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