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Posted to commits@pig.apache.org by Apache Wiki <wi...@apache.org> on 2008/11/12 22:51:35 UTC

[Pig Wiki] Update of "PigUserCookbook" by OlgaN

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The following page has been changed by OlgaN:
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  C = join small by t, large by x;
  }}}
  
+ In some of our tests we saw 10x performance improvement as the result of this optimization.
+ 
  '''Prefer DISTINCT over GROUP BY - GENERATE'''
  
  When it comes to extracting the unique values from a column in a relation, one of two approaches can be used: