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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hive/LanguageManual/Joins" by NamitJain
Date Wed, 31 Mar 2010 21:36:19 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Hive/LanguageManual/Joins" page has been changed by NamitJain.
http://wiki.apache.org/hadoop/Hive/LanguageManual/Joins?action=diff&rev1=17&rev2=18

--------------------------------------------------

    FROM A a join B b on a.key = b.key
  }}}
  can be done on the mapper only. The mapper for the bucket for A will traverse the corresponding
bucket for B. This is not the default behavior, and the following parameters need to be set:
- (((
+ {{{
    set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
    set hive.optimize.bucketmapjoin = true;
    set hive.optimize.bucketmapjoin.sortedmerge = true;
- )))
+ }}}
  

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