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The following page has been changed by OlgaN:

  The data coming out of the join is not guaranteed to be sorted on the join 
key which could cause problems for queries that follow join by `GROUP` or 
`ORDER BY` on the prefix of the join key. This should be taken into account 
when choosing join type.
  Note that CROSS can take advantage of this approach as well.
+ Details of the current implementation and performance measurements can be 
found in PigFRJoin.
  === Indexed Join (IJ) ===

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