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The "Pig070IncompatibleChanges" page has been changed by PradeepKamath.
http://wiki.apache.org/pig/Pig070IncompatibleChanges?action=diff&rev1=15&rev2=16

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  This functionality was added to deal with gap in Pig's early functionality - 
lack of numeric comparison in order by as well as lack of descending sort. This 
functionality has been present in last 4 releases and custom comparators has 
been depricated in the last several releases. They functionality is removed in 
this release.
  
+ == Merge Join ==
+ In Pig.0.6.0 there was a pre-condition for merge join: "The loadfunc for the 
right input of the join should implement the SamplableLoader interface" - this 
condition is no longer required in Pig 0.7.0. All other pre-condtions still 
hold.
+ 

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