[Performance] Create a single combiner class to add MultiQuery optimization
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Key: PIG-1439
URL: https://issues.apache.org/jira/browse/PIG-1439
Project: Pig
Issue Type: Improvement
Reporter: Richard Ding
Right now Pig uses two combiner classes (PigCombiner & DistinctCombiner)
respectively for group by and distinct operations. This prevents the
MultiQueryOptimizer to merge jobs with different types of combiners. The
proposal here is to merge these two combiners into a single Pig combiner so
that the optimizer can merge group by jobs with distinct jobs.
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