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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,

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The "Hive/LanguageManual/Joins" page has been changed by NamitJain.


    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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