Pig should enable an option to disable the use of optimizer

                 Key: PIG-581
                 URL: https://issues.apache.org/jira/browse/PIG-581
             Project: Pig
          Issue Type: Improvement
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
             Fix For: types_branch

There are some cases where a combiner optimization chosen by Pig may actually 
be slower than the non optimized version. For example, the use of combiner to 
address the issue reported in https://issues.apache.org/jira/browse/PIG-580 
could result in slower execution IF the distinct on groups of values does not 
actually shrink those groups. This is however very data dependent and the user 
may know before hand that this might be the case and may wish to disable the 
use of the optimizer. Pig should enable an option to do so.

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