Problems with partition filter optimizer
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                 Key: PIG-1267
                 URL: https://issues.apache.org/jira/browse/PIG-1267
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.7.0
            Reporter: Richard Ding
            Assignee: Richard Ding


There are a couple of problems with the current partition filter optimizer:

1. When a partition filter is removed from the logical plan, the input index of 
the following join/cogroup operator may change, which in turn changes the 
ordering of the fields in the schema and results in compile-time errors.

2. At most one partition filter can be removed per plan,  while multiple 
partition filters can exist in the cases of joins. 



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