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The following page has been changed by PiSong:
http://wiki.apache.org/pig/NestedLogicalPlan

The comment on the change is:
misspelling!!!!

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  [shrav] Pig already kind of does what you are saying here; just that it does 
it implicitly. The loadTuple is infact what happens when a nested plan is 
processed. I guess the way to extend the language would be to just allow all 
the operators that we allow outside a nested plan inside of it. In fact, the 
execution side, that is the Physical side, already supports it. Just that we 
need to make appropriate parser changes and the hard thing would be to do type 
checking and parsing itself.
  
- [pi] I think in logical plan change, I would be better to have something that 
indicates the link between outer/inner. I don't find any existing operator fit 
in this. I agree that it doesn't have to be explicit.
+ [pi] I think in logical plan change it would be better to have something that 
indicates the link between outer/inner. I don't find any existing operator fit 
in this. I agree that it doesn't have to be explicit.
  ==== More examples ====
  
  Given GENERATE: Tuple -> Tuple

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