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The following page has been changed by RichardDing:
http://wiki.apache.org/pig/PigMultiQueryPerformanceSpecification

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     2. Set the index on the leaf operator of the map plan based on the order 
this map plan on the inner plan list.
     3. Add the reduce plan of the splittee to the inner plan list of the demux 
operator in the same order as the corresponding map plan.
     4. The outputs of merged map plan of the splitter are indexed key/value 
pairs and are sent to the reduce tasks.
-    5. The demux operator extracts the index from the key/values it receives 
and attaches them to the corresponding reduce plan in its inner plan list.
+    5. The demux operator extracts the index from the key/values it receives 
and uses it to find the corresponding reduce plan in its inner plan list.
     6. The chosen reduce plan consumes the key/values data.
   
  [[Anchor(PartitionScheme)]]

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